high quality nylon

S size 25cm(bottom length)*34cm(height)*13cm(bottom thickness),advising height 100-115cm,age 3-5years old
M size 28cm(bottom length)*38cm(height)*14cm(bottom thickness),advising height 115-125cm,advising 1-2 grade
L size 30cm(bottom length)*43cm(height)*16cm(bottom thickness),advising height 125-140cm,advising 3-5 grade
Maybe with 1-3cm size error.

Notes:Only the L size is three layers school bag, the S size and M size are double layers school bag.