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multilayer space, reasonable storage, large capacity main bag, clear layering and reasonable placement external portable charging, just connect the mobile charger to the internal data cable of the backpack to realize the charging function it is made of high-density nylon fabric, which is easy to take care of, strong and durable. it is reinforced by triangle, car seams, breathable shoulder straps, and adjustable shoulder straps cyclic breathable scientific weight reduction, s-shaped shoulder belt, honeycomb mesh shoulder belt, widened and thickened, balanced stress, protected spine, reduced shoulder pressure multi functional backpack, small front bag/front bag/main bag/side bag, good products for leisure/business trip/play/shopping.syi