First, it is usually cut according to the shape of the waist, and the materials are thick and light. Some backpacks have a belt thickness of 2 cm.
Second, the width of the waist-to-waist contact area should be at least 10 cm, and its length should be at least 6 cm beyond the sacrum.
Third, the abdomen turns into a wide and strong tie, and the ends are connected by snaps, and the brand and production time are clearly marked on the snaps.
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