A backpack — also called bookbag kitbag knapsack rucksack pack — is in its simplest form a cloth sack carried on one's back and secured with two straps .
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- 大图:3416 × 4200 像素·28.92 cm × 35.56 cm·300dpi·JPG
- 中图:813 × 1000 像素·28.68 cm × 35.28 cm·72dpi·JPG
- 小图:407 × 500 像素·14.36 cm × 17.64 cm·72dpi·JPG