Made of A+ grade durable nylon tear-proof fabric; scratch-resistant, water-repellent, not easy to fade after long-term use, and abrasion resistance 10 times higher than conventional polyester fabric. This accessory is freely adjustable from 8.26 x 2.75 inches to 8.26 x 5.9 inches via 3 side buckles and top drawstring, and fits most standard size 16 oz - 84 oz water bottles, such as sports bottles, drink bottles, as well as umbrellas or emergency bottles tool. If your bottle is clear, you can quickly check how much water is left in the bottle through the gap. While providing necessary protection, it is also lighter and more portable than other ordinary styles, making it more suitable for outdoor activities. The less burdensome it is, the more enjoyable the trip will be. There are 2 buckle straps on the side to attach to tactical backpacks, combat vests, belts and other tactical gear. The 2 D-rings on the top also allow it to be attached to a carabiner, hook or shoulder strap for quick and easy operation. Perfect for running, hiking, camping, hunting, fishing, biking, climbing, shopping, traveling, climbing, sports and fitness, etc. You can also carry it with you, hang it on your belt, backpack, bicycle, car, etc.