Features: Waterproof nylon with wearable and rip-resistant polyester fibre. Adjustable shoulder straps to make a best fit with you. Smooth dual zippers make it easy to get your wanted things. Large capacity could hold substantial items, compartments in different sizes to sort more orderly. Outer carrying straps could carry packed tents or slepeing bags conveniently. Several hanging sets to attach some items with hook to your backpack conveniently. Breathable honeycomb mesh of back and shoulder straps can relieve carring burden. Free rain cover shelters it from heavy rain or snow.