1. Flexible Adjustment: The diameter adjustment range is 6–10 cm, making it compatible with outdoor water bottles of various sizes. It can meet the requirements of different equipment combinations without the need to water bottles when switching. 2. Secure Fastening: The water bottle is firmly locked in place with a hanging device and a Velcro strap for double fixation. During intense physical activities like hiking and mountaineering, the bottle won't wobble or fall, ensuring you always have drinking water on hand. 3. Lightweight and Durable: Made from quality nylon material, it is lightweight and won't add extra burden. It's also wearresistant and tearresistant, making it suitable for complex outdoor environments and less prone to damage even with longterm use. 4. Easy Installation: It can be mounted on a backpack with simple operation. The Velcro opening and closing design allows you to take out and refill water in one step without unloading the bag, improving the efficiency of outdoor activities.