DescriptionMade of premium material, the hydration pack is waterproof and breathable. Soft and thin mesh padding of hydration vest is designed for optimal comfort and absorbing sweat efficiently. The flexible adjustable straps help backpack hug your body nicely. With the functional pocket, you can store phone, water bottle, keys and other items conveniently. It is for hiking, running, climbing, camping and other outdoor activities.Feature- Color: Black. - Material: Nylon. - Size: About 4.3 x 2.4 x 3.5cm/1.7 x 0.9 x 1.4inch. - It is great running backpack for biking, running, hiking, climbing and other outdoor adventures. - Soft and thin mesh padding of hydration vest for optimal comfort and absorbing sweat efficiently. The flexible adjustable straps help backpack hug your body nicely. - The wide and breathable straps distribute weight effectively, reducing strength consumption. The race vest provide you with the max support and min burden. - Functional pcoket. The super pocket can help store water bottle, phone, keys, foods and other items.- Waterproof design makes it safe to store your belongings wherever you are.