KAKA Men Outdoor Sports Large Capacity Hiking Backpack Shool Backpack-Ideal for Hiking, Camping, Climbing, Traveling, Running, Cycling, Exercising or Other Outdoor Activities 40L High quality material, comfortable, wear-resistant and durable. Capable of relieving pressure on shoulders with the widened and thickened adjustable breathable shoulder straps. Large capacity with many zipper pockets, mesh pockets and multilayer design. High quality zippers, portable belt and brand buckles selected on the bag. Good air permeability and heat dissipation with mesh fabric and sponge made on the back of the bag.