Shock absorbent backpack with lighten your load

More about the shock absorbent backpack:

This shock absorbent backpack is a must for anyone who wants to reduce the weight load on their back, neck, knees, and ankles. Whether you are a commuter, hiker, or in the military, this backpack will lighten the load and make it so much easier to carry heavy equipment. It dramatically reduces the dynamic forces due to its patented double-frame and pulley system design.

A study shows in the journal,

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