To provide a structure for solving the problems which may occur by holding baggage during the use of a rubber bladder.

This rubber bladder comprises a small object storage space 9 for storing small objects and partition walls 11 for holding the space. The partition walls 11 are installed on the inner peripheral surface of the space in a body 7 to divide the space into three parts, that are, a body inside space 8 and holding spaces 10. The body inside space 8 and the holding spaces 10 are basically formed in air chambers. Since the small object storage space 9 is formed with an entrance 3 connected to the outside for storing small objects and can collectively hold the baggage by installing a cover 6, the baggage is prevented from being lost when the plurality of baggages are held or wetted with water by the presence of the cover 6, and also since the small object storage space 9 is not submerged in water even if a hole is opened in the body 7 by the presence of the plurality of spaces by the formation of the partition walls 11, the economical loss of a user can be prevented from occurring.