1, small size: high 29 * wide 20 thick 13CM, 7L, can not fit A4 paper;

  2, medium size: high 38 * wide 27 thick 11cm, 16L can hold A4 paper and 14-inch notebook;

  3, large size: height 42 * width 32 thickness 13cm, 20L for people around 175cm height, can hold 15 inch laptop