Features: The water bag backpack has a capacity of 3L, which is sufficient to provide long-term drinking water needs and is suitable for outdoor sports and outdoor activities. Made of wear-resistant and waterproof nylon material, it has good durability and tear resistance, ensuring reliability in various complex environment. Adopting ergonomic designs, the back and shoulder straps are made of breathable mesh material, reducing the burden on the back and providing a comfortable wearing experience. The backpack shoulder strap can be freely adjusted in length to adapt to different body shapes and riding postures, making it more comfortable for users to engages in cycling or outdoor activities. Suitable for people who enjoy outdoor activities such as hiking, hiking, camping, etc., and can meet their drinking water needs during the activity process. Specifications: Material: Nylon Color: Black/Green/CamoColor Size: Approx. 17x4x44.5cm/6.69x1.57x17.52inch Package Includes: 1x Tactically Hydrations Pack Backpack note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.