Made from high quality materials, fully pressure and leak proof, suitable for outdoor sports. There is no need to worry about water leakage for the reversing valve and cover, just open the dust cover, bite the tube head with your teeth, and absorb water gently at the same time. Upgraded hydration backpack: cycling backpack with hydration bag, designed with two belts, to solve the problem that the chest strap makes the uncomfortable neck when driving. At the shoulder strap, a clip is designed to fix the position of the drinking water hose so that it does not swing freely during movement. Lightweight and small bike backpack: 2 mesh pockets on both sides of the bag can keep small things at will. It has three zippers. It has 4 pocket compartments and enough pockets for your outdoor sports needs. It can store phone, keys, thin raincoat, hydration pack and other outdoor activities. Reflective strips and wear-resistant waterproof material: Reflective material can guarantee safety in any light at night, suitable for night running, cycling, hiking, jogging, marathon. Waterproof material, even in rainy days, don't worry about wet backpack items. Wear-resistant material, outdoor hiking, mountaineering, backpack will not be scratched. Suitable for a variety of outdoor sports: the size of the water bag backpack is 43cm x 30cm, lightweight and practical style, the backpack with the water bag is suitable for outdoor sports such as cycling, hiking, jogging, night running, mountaineering, hiking 'adventure. , marathon and so on. The backpack is unisex and also makes a great gift for Christmas, Thanksgiving, Father's Day, Mother's Day, birthdays and other holidays. Package Contents: 1 x hydration pack backpack. We only sell hydration packs, not other items in the picture. Due to factors such as measurements manuals and display differences, there may be slight differences between individual products and images.