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Balance Backpack is a backpack that can adjust the length of both shoulder straps at the same time, keeping them balanced.
When everyone wears a backpack, the length of both shoulder straps is different.
The problem is that it is difficult to adjust the length of the left and right sides, and even if the length of the left and right sides are the same, the length of one side is increased or decreased during the activity, resulting in an imbalance.
Especially for growing children, different lengths of both shoulder straps can cause left and right shoulder height changes and spinal deformations.