This Naturehike backpack, made of high quality water and tear resistant 30D nylon YKK silicone sealed zippers are waterproof Fine nylon seams ensure a durable strong material connection Adjustable shoulder straps Quality is far superior to most polyester or 210T nylon backpacks Silicone coated nylon fabric is PU 2000mm water resistant, all silicone sealed zippers can be opened and closed quickly The main pocket is large enough to hold what you need when you are out and about or traveling Outer pocket and inner zippered pocket, is great for quick access such as guidebooks and valuables Two large side mesh pockets for water bottles or umbrella.