BACKGROUND ART There are many cases where the personal effects contained in the backwardly exposed small-sized pocket of conventional sacks or backpacks used by the above-mentioned students or backpackers or overseas travellers are pickpocketed or stolen without their knowledge especially in such crowded places as buses, subways, trains, streets or during overseas trips, since they-can not easily see or feel the small-sized pocket due to its backward location.

DISCLOSURE OF INVENTION The purpose&benefitof this invention is to provide the sacks or backpacks which can keep or store the personal effects more safely by positioning the small-sized pocket of the conventional sack or backpack into the backside of the big-sized main body pocket.

BRIEF DESCRIPTION OF DRAWI&GS Figure 1 is a perspective view of the conventional sack or backpack.

Figure 2 is a perspective view of this invention.

Figure 3 is an inside open perspective view of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION The sack or backpack designed & made by this invnetion is characterized by consisting of the main body with the big-sized main pocket opened by zipper formed in line with the rims of the main body, the shoulder-straps and the small-sized pocket with zipper placed-backside.

Normally the zipper of the big-sized main pocket can be formed like the existing sack or backpack, but can be positioned backside exactly to this invention. The figures say that the big-sized main pocket (Figure 1.1) and the samll-sized pocket (Figure 1.2) are moved & formed backside like the big-sized pocket (Figure 2.1) & the small-sized pocket (Figure 2.2) with the inner storing place (Figure 3.2) on the back of the cover of the main pocket. Thus, the risk of the personal effects in the small-sized pocket as well as in the main pocket being pickpocked or stolen by

someone is much reduced without the knowledge of the users. In order to make the safety of the personal effects higher, the alarm devices like the small bell (Figure 2.6) can be hung between the shoulder strap (Figure 2.4) and the string (Figure 2.5) connected with the holder of the zipper of main pocket. In case someone try to cut off or snatch the connected string ; then the sound of bell will alarm them away.

INDUSTRIAL APPLICABILITY From the benefit of this invention, the personal effects especially like cell-phone, walkman, wallets, calculators mainly contained in the small-sized pocket can be stored more safely.