| 摘要 |
A school book back satchel includes a rigid back piece, a rigid lower piece which, when secured to the back piece, defines a bag supporting pocket, and a rigid upper lid piece. The back piece has a lumbar groove widened at its lower end, a transverse ventilation groove, an outwardly contoured lower portion, strap accommodating slots, and a disappearing handle. A waterproof accordion bag is snapped, riveted or glued onto the back piece, and may be provided with closure straps, a channel to receive the ends of the shoulder straps, or external flap pockets. The satchel volume may be increased by inserting a rigid expansion ring, and the parts may be held together by a channeled rubber band to facilitate component changes.
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