Background of the Invention 1. Field of the Invention The present invention is directed to fluid dispensing systems and, more particularly, to a bottle cap that enables fluid disposed in a container to be selectively accessed when the container is loaded onto a dispensing system.

2. Discussion of Related Art As is well known in the art, and as illustrated in Fig. 1, a water bottle 10 (e. g., a conventional three or five gallon bottle) may be sealed on one end by a cap 100, and a water dispenser 12 may be designed to receive the water bottle 10 to enable water 11 within the water bottle 10 to enter a chamber 14 prior to being dispensed through a dispensing system 16. The water bottle 10 may be mounted to and removed from the water dispenser 12 as illustrated by arrow 31 in Fig. 1. As shown, a probe 18 may be provided on the water dispenser 12 to pierce the cap 100 when the water bottle 10 is mounted to the water dispenser 12, thereby enabling the water 11 to flow from the water bottle 10 to the chamber 14 of the water dispenser 12. Filtered air may be provided to the chamber 14 through a filtered air system 20 to enable water to be drawn from the chamber 14 when the dispensing system 16 is activated. One example of a water dispensing system similar to that shown in Fig. 1. is disclosed in U. S. Patent No. 4,699,188, entitled HYGIENIC LIQUID DISPENSING SYSTEM, the entire contents of which is hereby incorporated herein by reference.

It is known in the art to provide a water dispenser 12 having a probe 18 with a sharpened, pointed end. With such a water dispenser 12, a water bottle 10 having a bottle cap 100 thereon may be inverted and placed on the water dispenser 12 so that the probe 18 impales a surface of the bottle cap 100, thereby creating an opening in the bottle cap 100 through which the water 11 can flow from the water bottle 10 to the chamber 14 of the water dispenser 12. An example of such a prior art water dispenser 12 is described in U. S. Patent No. 4,699,188. With such water dispensers 12, however, there is a risk that a person replacing a water bottle 10 or otherwise manipulating the water dispenser 12 may be injured

by the sharpened end of the probe 18. In addition, after the sharpened point of the probe 18 has penetrated the bottle cap 100, if the water bottle 10 is removed from the water dispenser 12 when there is still water in the water bottle 10, water may exit the bottle via the opening created by the probe and spill onto the outside of the water dispenser 12 and/or the floor.

Rather than relying on a pointed probe 18 to impale a bottle cap 100, some prior art water dispensing systems have employed alternative techniques for breaking a seal of a bottle cap 100 when the water bottle 10 is inverted and installed on the water dispenser 12. For example, U. S. Patent No. discloses a bottle cap 100 having a removable plug inserted therein to seal the water bottle 10. In the system disclosed in this reference, when a blunt probe 18 is inserted into the end of the bottle cap 100, the plug becomes lodged on the end of the probe 18 and is pushed into the water bottle 10 along with the probe 18. When the probe 18 is then removed from the bottle cap 100, the plug is reseated into the end of the bottle cap 100 so that the water bottle 10 is again sealed. With this type of bottle cap 100, there is a risk that the removable plug may become dislodged from the end of the probe 18 when the probe 18 is inserted in the water bottle 10, thereby possibly enabling water to spill onto the outside of the water dispenser 12 and/or the floor when the water bottle 10 is removed from the water dispenser with water remaining in the water bottle 10. In addition, the requirement that a specialized plug be included in each bottle cap 100 can significantly increase the manufacturing cost of these types of bottle caps 100.

Other prior art bottle caps 100 that are designed for use with blunt-ended probes 18 are disclosed in U. S. Patent Nos. 5,687,867 and 5,687,865. The bottle caps 100 disclosed in these patents include conical surfaces which are scored along one or more meridian planes thereof to enable the ends of blunt probes 18 to readily penetrate them. In U. S. Patent No.

5,687,867, a single frangible line extends through a meridian plane of the to-be-penetrated cone so that, when a blunt probe 18 is pressed against an inner surface of the cone, the cone is caused to split into two halves as the probe 18 enters the water bottle 10 via the bottle cap 100. This patent teaches that the two halves of the cone can be made of a resilient plastic material that causes the cone to return substantially to its original shape, thereby inhibiting water from exiting the water bottle 10 if the water bottle 10 (with water remaining therein) is removed from the water dispenser 12. However, because the shape memory of the plastic material forming the cone is not perfect (i. e., some permanent deformation will necessarily

occur in response to the cone being penetrated by the probe 18--especially when the probe remains in the cone for an extended period of time), the cone will never return completely to its pre-penetrated shape and some sort of opening will always be left between the two halves of the cone after the probe 18 is removed from the bottle cap 100. Some water therefore will be permitted to escape from this opening when a water bottle 10 having water remaining therein is removed from the water dispenser 12. This fact is explicitly pointed out in the written description of this patent.

In U. S. Patent No. 5,687,867, frangible lines extend through multiple meridian planes of the to-be-penetrated cone so that, when a blunt probe 18 is pressed against an inner surface of the cone, the cone is caused to fragment into several petal portions as the probe 18 enters the water bottle 10 via the bottle cap 100. When the probe 18 is removed from the cone, however, the petals of the cone do not return to their original shapes. Therefore, some opening will always be left between the cone's petals after the probe 18 is removed from the bottle cap 100.

Other techniques for enabling a water bottle 10 to be installed on a water dispenser 12 are disclosed in U. S. Patent Nos. 5,456,294 and 5,472,021. In each of these patents., a specialized structure is used to create an opening in a bottle cap 100 in response to the creation of a hydraulic shock wave within the water bottle 100, e. g., when a person physically strikes the sides of the bottle 10. Using these techniques, however, it is possible that the bottle cap 100 may prematurely permit water to exit the bottle 10 if a physical force is exerted on the water bottle 10 before it is properly installed on the water dispenser 12. Additionally, if water bottles employing these bottle caps 100 are removed from the water dispenser 12 before the water bottle 10 is emptied completely, water may spill onto the outside of the water dispenser 12 and/or the floor.

Still further techniques for enabling a water bottle 10 to be installed on a water dispenser 12 are disclosed in U. S. Patent No. 5,363,890. Disclosed in this patent are techniques which delay the time taken for water to exit the water bottle 10 after the water bottle 10 is inverted for installation on a water dispenser 10. Specifically, this reference teaches that a membrane seal in the bottle cap 100 which is folded multiple times can be caused to gradually unfold in response to water pressure being exerted thereon when the water bottle 10 is inverted for installation. It also teaches that, alternatively, a water sensitive

material can be employed in the bottle cap 100 to gradually enable water to exit the water bottle 10 as the material reacts to water that comes into contact therewith when the water bottle 10 is inverted for installation. As with the techniques described above requiring hydraulic shock waves to activate opening of the bottle cap 100, there is a risk that water will exit the water bottle 10 prematurely, i. e., before the water bottle 10 is properly mounted on the water dispenser 12, if the water bottle 10 is inverted during storage or if an excessive period of time elapses between when the user inverts the water bottle 10 and when the user actually installs the water bottle 10 on the water dispenser 12. Further, if water bottles employing these bottle caps 100 are removed from a water dispenser 12 before the water bottle 10 is emptied completely, water may spill onto the outside of the water dispenser 12 and/or the floor.

What is needed, therefore, is an improved technique for mounting a container (e. g., a water bottle) having a fluid (e. g., water) disposed therein to a fluid dispenser (e. g., a water dispenser), and an improved system or apparatus for accomplishing the same.

Summary of the Invention According to one aspect of the present invention, an apparatus is disclosed for adapting a container having fluid disposed therein and an opening oriented in a first plane to be mated with a device for dispensing the fluid. The apparatus includes a cap which is adapted to cover the opening in the container. The cap includes a frangible path arranged substantially in a second plane which, when the cap covers the opening, is substantially coincident with or parallel to the first plane. The frangible path defines a flap to be formed when the frangible path is broken such that, when the frangible path is broken, the flap remains connected to the cap by a hinge portion and can be opened so that the fluid can pass from the container to the device for dispensing the fluid via the flap.

According to another aspect of the invention, a method is disclosed for mating a container having fluid disposed therein with a device for dispensing the fluid. The container having the fluid disposed therein is provided with a cap disposed thereon which includes a frangible path defining a flap to be formed when the frangible path is broken. The frangible path is disposed substantially in a plane and is arranged such that, when the frangible path is broken, the flap remains connected to the cap by a hinge portion. The device for dispensing

the fluid is provided so as to have a probe disposed thereon. According to the method, the frangible path is broken with the probe by moving the container in a direction which is substantially perpendicular to the plane in which the frangible path is disposed, and the cap is penetrated with the probe via the flap.

Brief Description of the Drawings Fig. 1 is a cross-sectional view of an illustrative water bottle and water dispenser that may be used with the bottle cap of the present invention; Fig. 2 is a side view of a bottle cap according to one embodiment of the present invention; Fig. 3 is a cross-sectional view of the bottle cap of Fig. 2 taken along line I-I of Fig. 2 and along line 11-11 of Fig. 4; Fig. 4 is a top view in partial cross-section of the cylindrical sidewall and flap of Fig.

2; Fig. 5 is a cross-sectional view of the bottle cap of Fig. 2 taken along line I-I of Fig. 2 and along line 11-11 of Fig. 4 prior to insertion of a probe of a water dispenser; Fig. 6 is a cross-sectional view of the bottle cap of Fig. 2 taken along line I-I of Fig. 2 and along line II-II of Fig. 4 subsequent to insertion of the probe, but before the probe tears the flap from the cylindrical sidewall along a frangible path of the bottle cap; Fig. 7 is a cross-sectional view of the bottle cap of Fig. 2 taken along line I-I of Fig. 2 and along line 11-11 of Fig. 4 after the flap has been separated from the cylindrical sidewall along the frangible path; Fig. 8 is a cross-sectional view of the bottle cap of Fig. 2 taken along line I-I of Fig. 2 and along line II-II of Fig. 4 after the probe has been partially withdrawn from the bottle cap; Fig. 9 is a cross-sectional view illustrating an alternative embodiment of the bottle cap according to the present invention; and Fig. 10 is a cross-sectional view illustrating another alternative embodiment of the bottle cap according to the present invention.

Detailed Description of the Invention According to one aspect of the invention, a specialized cap 100 is adapted to be penetrated by a blunt probe 18. The cap 100 includes a frangible path defining a flap to be formed when the frangible path is broken in response to the probe 18 penetrating the cap 100.

Advantageously, the frangible path of the cap 100 may be disposed substantially in a first plane which may be both (1) parallel to a second plane in which an opening of the bottle (to which the cap is attached) is disposed, and (2) substantially perpendicular to the direction in which the bottle 10 is moved to cause the probe 18 to penetrate the cap 100. In addition, the frangible path may define the flap in the first plane so that a hinge portion of the flap remains connected to the cap 100 after the probe 18 has been inserted into the cap 100. When the probe 18 is later removed from the cap 100, the flap may be caused to close so that water 11 remaining in the water bottle 10 is inhibited (i. e., slowed down to a substantial degree) from exiting the water bottle 11. The hinge portion of the flap may be made of a material having a sufficient shape memory that the flap is at least slightly biased toward the closed position but is flexible enough that the water pressure of the water remaining in the bottle 10 has a substantial effect in further biasing the flap toward the closed position.

One illustrative embodiment of a cap 100 configured according to this aspect of the invention is illustrated in Figs. 2-4. The cap 100 may be formed of any of numerous materials and may be constructed in any of a number of ways, and the invention is not limited to a cap made of any particular type of material or manufactured in any particular way. The cap 100 may, for example, be made of a suitable plastic (e. g., low density polyethylene) and may be manufactured using a conventional injection-molding technique. In one embodiment, all plastic components of the cap 100 are formed in a single injection molding step so as to form a single, unitary plastic structure.

As shown in Fig. 2, the cap 100 may include a skirt 110 and a crown 112. The cap 100 may further include a frangible path 114 (e. g., a score line) extending between the skirt 110 and the crown 112 to enable the skirt 110 to be selectively torn from the crown 112. The frangible path 114 may also extend from the crown 112 to a proximal edge 115 of the skirt 110. A pull tab 116 with several grip lines 118 may be attached to the skirt 110 at the proximal edge 115 near the frangible path 114. By pulling on the pull tab 116, the user can cause the skirt 110 to tear along the frangible path 114 from the proximal edge 115 of the

skirt 110 to the crown 112 of the cap 100, and then substantially around a perimeter of the crown 112. After the skirt 110 has been removed in this manner, the cap 100 can be readily removed from the bottle 10, thereby permitting the bottle 10 to be used with water dispensers 12 that are not equipped with probes 18. As shown in Figs. 2 and 3, a ridge 120 may be provided on the crown 112 to enable the user to grasp the cap 100 more easily when lifting the bottle 10.

As shown in Fig. 3, an inside surface 15 of the cap 100 may be adapted to mate with a neck 13 of the bottle 10. Specifically, the inside surface 15 may be provided with a thickened portion 122 to mate with an area of reduced circumference 17 of the bottle 10 and to provide strength to the skirt 110 near the frangible path 114. A second thickened portion 124 may also be provided on the inside surface 15 of the cap 100 to mate with a corresponding sloped surface 19 on the neck 13 of the bottle 10 adjacent a distal end 21 of the bottle 10. The second thickened portion 124 may be slid over a crown 23 of the bottle 10 to pull the cap 100 onto the neck 13 of the bottle 10. The second thickened portion may also provide a secondary hermetic seal between the cap 100 and the neck 13 of the bottle 10 to prevent water from leaking out of and/or to prevent contaminants from entering the bottle 10.

A primary hermetic seal between the cap 100 and the neck 13 of the bottle 10 may be provided by an annular ridge 126 adjacent a distal end 25 of the cap 100. As shown in Fig. 3, the annular ridge 126 of the cap 100 may physically contact the entire circumference of the crown 23 of the bottle 10, thereby forming a hermetic seal between the cap 100 and the bottle 10. More than one ridge 126 may be used to form one or more additional hermetic seals between the insider surface 15 of the cap 100 and the neck 13 of the bottle 10, if desired. The ridge 126 may deform slightly when the cap 100 is seated on the bottle 10, thereby forming a more secure seal between the inside surface 15 of the cap 100 and the neck 13 of the bottle 10.

As illustrated in Fig. 3, an annular indented region 128 may be formed at the distal end 25 of the cap 100. In the embodiment shown, the indented region 128 is formed around a central well 130 formed by the cap 100. As explained in more detail below, the central well 130 may receive the probe 18 when the probe 18 is inserted into the bottle 10 via the cap 100.

The annular indented region 128 may be adapted to receive an adhesive label (not shown) that covers the central well 130, thereby maintaining the central well 130 free of dust and

other debris. Optionally, the label may be printed with identifying information to enable the source of the water 11 to be identified readily.

As shown in Figs. 3 and 4, the central well 130 may be defined by a cylindrical wall 132 having an upper portion 134 and a lower portion 136, with the upper portion 134 being disposed closest to the distal end 25 of the cap 100 and the lower portion 136 being disposed farthest therefrom. The lower portion 136 of the cylindrical wall 132 may be configured to have a diameter that is equal to or marginally smaller than the outer diameter of the probe 18 with which it is to be used, thereby ensuring a proper seal between the probe 18 and the central well 130 of the cap 100 when the probe 18 is inserted into the central well 130. The upper portion 134 of the cylindrical wall 132 may be configured such that its diameter is slightly larger than a diameter of the probe 18. The larger diameter of this upper portion 134 can facilitate seating of the probe 18 into the central well 130 when the bottle 10 is placed on the dispenser 12. In one illustrative embodiment, the inner diameter of the upper portion 134 of the cylindrical wall 132 is"765"thousandths of an inch (mils), the outer diameter of the probe 18 is"750"mils, and the inner diameter of the lower portion 136 is"745"mils.

As shown in Fig. 3, the upper and lower portions 134 and 136 of the cylindrical wall 132 may be separated by a transition portion 138 formed perpendicular to each of the upper and lower portions 134 and 136. Alternatively, the transition portion 138 may be oriented an acute angle (i. e., between zero and ninety degrees) with respect to at least one of the upper and lower portions 134 and 136. Optionally, the upper and lower portions 134 and 136 may be blended together so that the cylindrical wall 132 has a gradually varying diameter along at least a portion of its length. Likewise, if desired, the cylindrical wall 132 may be formed to have a uniform diameter along its entire length which is approximately equal to or slightly smaller than the diameter of the probe 18, thereby forming a hermetic seal between the entire inner surface of the cylindrical wall 132 and the outer surface of the probe 18 when the probe is disposed in the well 130.

Advantageously, as illustrated in Figs. 3 and 4, a frangible path 142 may define a flap 140 to be formed when the frangible path 142 is broken in response to the probe 18 penetrating the bottle cap 100. Before the frangible path 142 is broken, the to-be-formed flap 140 serves as a bottom surface of the central well 130. The flap 140 may be attached to the cylindrical wall 132 at any of a number of locations to form the well 130 and the invention is

not limited to any particular attachment points of the flap 140. In the illustrative embodiment of Fig. 3, for example, the flap 140 is attached to the cylindrical wall 132 along the lower portion 136 of the cylindrical wall 132.

As shown in Figs. 3 and 4, the frangible path 142 may be formed around a substantial portion of a perimeter 27 of the flap 140, to enable the flap 140 to be almost completely separated from the cylindrical wall 132 upon insertion of the probe 18 into the well 130. The frangible path 142 may be formed in any of numerous ways, and the invention is not limited to any particular technique for forming the same. It is important only that the frangible path 142 be more fragile than the portions of the bottle cap 142 surrounding it, thereby permitting the flap 140 to be readily separated from the cylindrical wall 132 (or another portion of the bottle cap 100) along the path defined by the frangible path 142 when the bottle 10 is inverted and placed atop the probe 18. The frangible path 142 may, for example, be a simple score line formed in the cap 100, or may, for example, be a portion of the cap 100 that has intentionally been physically or chemically weakened after formation.

In the embodiment shown, the frangible path 142 does not extend completely around the perimeter 27 of the flap 140. Rather, as best shown in Fig. 4, the frangible path 142 does not intersect a hinge portion 144 of the cap 100. Therefore, after the frangible path 142 is broken when the probe 18 is inserted through the bottle cap 100, the flap is permitted to swing about the hinge portion 144, but remains connected to the bottle cap 100. To permit the flap to swing in this manner, the ratio of the perimeter of the flap to the width of the hinge portion may, for example, be greater than four to one, greater than ten to one, or even greater than forty to one.

Referring to Figs. 4 and 5, example dimensions of various portions of the cap 100 relating to the functionality of the flap 140 are provided. As shown in Fig. 5, the thickness (T,) of the frangible path 142 may, for example, be between three and ten mils (preferably approximately ten mils); the thickness (T2) of the hinge portion 144 may, for example, be between twenty and sixty mils thick (preferably approximately thirty five mils); and the thickness (T3) of the flap 140 may, for example, be between twenty and sixty mils (preferably about thirty five mils). The hinge 144 may be the same thickness, thicker or thinner than the flap 140. As shown in Fig. 4, the width (W,) of the frangible path 142 may, for example, be between one and ten mils (preferably approximately three mils); and the width (W2) of the

hinge portion 144 may, for example, be between thirty and one hundred and eighty mils (preferably approximately one hundred and fifty mils). The hinge 144 preferably should have a sufficient width (W2) and thickness (T2) as compared to the width (W,) and thickness (T,) of the frangible path 142 to prevent the flap 140 from separating from the cylindrical wall 132 upon insertion of the probe 18 into the central well 130.

In some embodiments, the hinge 144 may be formed of multiple sections (not shown), with each portion being connected between the flap 140 and the cylindrical wall 132. For example, the hinge 144 shown in Fig. 4 may comprise two distinct portions (each thirty mils wide) separated by a space of ninety mils. This addition of one or more spaces between multiple portions of the hinge 144 may increase the flexibility of the hinge 144 to improve the functionality of the cap 100 as described herein. When a multiple section hinge 144 is employed, the width of the hinge 144 is considered to be the sum of the widths of the composite portions thereof, and does not include the width of the spaces therebetween.

Therefore, in the example given above wherein the hinge 144 includes two distinct portions (each thirty mils wide) separated by a space of ninety mils, the width (W2) of the hinge 144 is considered as being sixty mils, rather than one hundred and fifty mils.

Figures 5-7 illustrate changes that occur to the cap 100 upon insertion of probe 18 into central well 130. Typically, but not necessarily, this occurs when a water bottle 10 carrying a cap 100 is lowered onto a water dispenser 12 employing a probe 18 (see Fig. 1). However, for convenience of description, this action will be described in terms of the probe 18 entering the central well 130 and piercing the cap 100, rather than in terms of the water bottle 10 moving toward the probe 18.

The probe 18 may be configured in any of numerous ways, and the invention is not limited to any particular type of probe. An example of a probe that may be used in connection with the present invention is disclosed in U. S. Patent No. 5,232,125, entitled NON SPILL BOTTLE CAP USED WITH WATER DISPENSERS, the entire contents of which is hereby incorporated herein by reference. As shown in Fig. 5, the probe 18 may be formed from a hollow tube 29 having a blunt, rounded top surface 180. The top surface 180 may be closed to prevent debris from falling through the probe 18 into the chamber 14 of the dispenser 12 when the water bottle 10 is not disposed on the dispenser 12. In this situation, at least one (and preferably more than one) aperture 182 may be formed through the wall of the

hollow tube 29 forming probe 18 so that, upon insertion of the probe 18 into the water bottle 10, water may flow through the aperture (s) 182, down through the probe 18, and into the chamber 14 of the water dispenser 12 (see Fig. 1).

As shown in Fig. 5, an opening 35 at the neck 13 of the bottle 10 may be oriented in a plane PI, and the cap 100 may substantially cover the opening 35. Advantageously, in the embodiment shown, the frangible path 142 (and therefore the to-be-formed flap 140) is disposed substantially in a plane P2, which is substantially parallel to the plane PI.

Alternatively, the plane P2 may be substantially coincident with the plane P 1. This orientation of the frangible path 142 with respect to the opening 35 helps enable the flap 140 to operate as discussed herein.

As also shown in Fig. 5, the bottle cap 100 may be configured such that the probe 18 can be inserted into the cap 100 (via the well 130) in a direction indicated by arrow 33. The plane P2 (in which the frangible path 142 may be disposed) may be oriented substantially perpendicular to the direction (indicated by the arrow 33) in which the probe 18 is inserted into the cap 100. This orientation of the frangible path 142 with respect to the direction in which the probe is inserted into the cap 100 also helps to enable the flap 140 to operate as discussed herein.

It should further be appreciated that, in the embodiment shown, the frangible path 142 extends only about the perimeter 27 of the well 130 and does not extend across a middle portion of the bottom of the well 130, as do the frangible lines in some prior art bottle caps.

This aspect of the invention significantly increases the ability of the flap 140 to reseal the cap 140 after the probe is removed from the cap 100 (see Fig. 8). In addition, it may be noted that the cylindrical wall 132 of the well 130 is not deformed when the probe 18 is inserted into the cap 10. When the cylindrical wall 132 is permitted to substantially maintain its shape in this manner, the ability of the cylindrical wall to form a hermetic seal with the probe 18 is improved significantly. In particular, it may be noted that, in the embodiment shown, a hermetic seal may be formed between the lower portion 136 of the cylindrical wall 132 and the probe 18, whereas this may not be done using some prior art bottle caps.

As illustrated in Fig. 6, the probe 18 may be inserted into the central well 130 until the top surface 180 of the probe 18 comes into contact with to-be-formed flap 140 defined by the frangible path 142. After the water bottle 10 is positioned over the probe 18 as shown in

Figs. 5 and 6, the weight of the water 11 in the water bottle 10 can cause the water bottle 10 to press down on the cap 100 to cause the probe 18 to push through the flap 140 and separate the flap 140 from the cylindrical wall 132 along the frangible path 142 (see Fig. 7). The hinge 144 is not severed in this process so that the flap 140 remains attached (via the hinge 144) to the cylindrical wall 132. When the probe 18 is so inserted in the central well 130, a hermetic seal may be formed between the probe 18 and the cylindrical wall 132 as discussed above.

After the probe 18 has been operatively positioned within the central well 130, when the probe 18 is retracted therefrom, as illustrated in Fig. 8, the hinge 144 may cause the flap 140 to return toward its initial sealed position. The hinge 144 thus may exhibit at least some shape memory tending to return the flap 140 to its closed position. However, the hinge may also be flexible enough that the water pressure of water remaining in the bottle 10 may further bias the flap 140 toward its closed position to an appreciable degree. In one illustrative embodiment, for example, the hinge may be made flexible enough so that when the water bottle 10 is at least twenty percent full, the water pressure of the water remaining in the bottle 10 may appreciably bias the flap 140 towards its closed position. When the flap 140 is returned substantially to its closed position in this manner, it is possible to minimize the amount of water 11 that is spilled when the water bottle 10 is removed from the water dispenser 12 when there is water remaining in the water bottle 10.

Alternative embodiments of the cap 100 are illustrated in Figs. 9 and 10. In these embodiments, the flap 140 is joined to the cylindrical side wall 132 at a location other than at the part of the cylindrical sidewall 132 farthest from the distal end 25 of the cap 100. In this regard, it should be appreciated that the flap 100 may be positioned at any location on the cap 100, and that the invention is not limited to embodiments wherein the flap 140 is disposed within a central cavity 130 formed by a sidewall 132. For example, the flap 140 may be disposed flush with the distal end 25 of the cap 100. Additionally, as shown in Figs. 9 and 10, rather than being flat, the flap may, for example, be curved inward (Fig. 9) or bowed outward (Fig. 10).

What is claimed is: