| 摘要 |
A backpack has a generally rigid support having a front face and a back face, shoulder straps attached to the support for holding same against a back of a user, and structure on the back face for holding an object. A pressurizable and flexible bladder covers generally all of the front face of the support and has a closable fill opening. This bladder is secured to the front face of the support with the fill opening accessible.
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