L:32*48*15cm, 900g, for grade 5-12 kids, even for an adult.
M:31*44*14cm, 800g, for grade 3-5 kids.
S:30*40*13cm, 700, for grade 1-3 kids.
NOTICE:
In order to satisfy cumstomers' need, we changed the pattern of side pocket, it's mesh side pocket now.
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