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People especially those with OCD(obsessive compulsive disorder ) adjust the length of the straps of backpacks always feel that the length of the two sides is not the same. Thus ,they will adjust them again and again. The whole process will make them anxious .In order to solve this problem, the straps are designed with scale .So people can adjust the length by the scale.The adjustment is more clear and it’s easy to make both sides have the same length.