Best-selling Waterproof Outdoor Sports Backpack Shoulder Belt Bag For Biking Cycling Traveling Camping Hiking outdoor travel Hydration Pack 20L 40Lsize:30*25*50cm 50Lsize:32*25*58cm Made of Nylon material. Powerful handling capabilities, high-capacity load space, set a variety of compartments Suspension removable suspension system, breathable perspiration, relieve burdened. Quality accessories, minus 50 degrees normal use, waterproof, tear-resistant. Outdoor plug-in system, you can plug tents sleeping bags, hiking, camping, get a pack.