Description
How to make it luminous.
( the black backgound means can luminous at night )
1.This backpack needs to absorb light in the daytime and shine at dark.
2.The longer the backpack absorbs light,The longer the backpack in the dark glow time.
3.You need to carry it in the sun for some time.And then walk to the dark place.
4.Then it will be luminous.
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