Suitable backpack size: 60L-70L Material: waterproof polyester fabric. Defends against rain, snow, road spray, mud, dust, and grime, keeping your backpack itself clean. The full‑coverage design ensures side pockets and the bottom are equally protected. Ultra-light, portable and foldable. Weighs only about 100 grams. Taking up almost no space in your bag. Great for business travel, hiking, camping, mountaineering, trekking, cycling, hunting and other outdoor activities It can also be used as a dust cover for barbecue grills, protecting camera bags or instrument cases. Also can be used as a temporary sit pad or ground cloth. Quick & Easy On/Off: Thanks to its full elastic strap, slipping the cover on and off is effortless—even in a hurry. Available in a variety of colors and sizes. Protect your backpack from rain, dust, mud, snow, etc.