High level of appearance beast package, multi-layer space receiving capacity. Reasonable structure, easy to receive, receive the complete isolation layer items neatly. Three-dimensional breathing cell chair back breathable backplane, honeycomb sandwich mesh, with excellent resilience and breathability, reduce the backpack pressure on the spine, help balance the force. Widening and thickening with effective buffer force, safe reflective product design, reliable, double zipper design, brand durability.