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When two men carry a heavy bag together, the difference of their heights may cause fatigue and harm on their shoulders especially for the taller one. The problem is even more severe when it comes to climbing the stairs with the heavy bag. The design named “Balance” is aimed at coping with this problem. We can adjust the length of the bag strap by pressing the switch attached to the handle, acquiring a good balance and making it relaxing and cozy for us to carry the bags.