| 摘要 |
PROBLEM TO BE SOLVED: To store a drink vessel such as a bottle and a can in a stable condition by utilizing a rib provided on an inner face of a pocket part. SOLUTION: Since a storage space A can be formed between a stopper 20 and a front wall part 14 of a pocket part 8 by merely forming the stopper 20 on a rib 17 for reinforcement formed on an inner face of a side wall part 10 of the pocket part 8, not only objects 22a, 22b such as books and documents but also a drink vessel 21 such as a bottle and a can be stored in a stable condition.
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