2L(70 oz) Hydration Bladder Bag: This water backpack passed pneumatic pressure and 24-hour swing test and 24-hour vibration test. Fully pressure and leakproof for carefree cycling, running, hiking, and other outdoor adventures. Made of EVA material, 100% odorless, tasteless.

High Quality and Comfortable Material: The hydration Backpack is made of high-grade nylon waterproof material, light, wearable, and comfortable, a breathable mesh back to prevent sweating and provide comfort, which is the best choice for outdoor sports.

Adjustable Shoulder Straps: Adjustable shoulder straps and chest straps allow you to make your hydration pack fit perfectly and prevent hydration backpack movement. The wide mesh shoulder strap helps to reduce the shoulder load, ideal for exploring nature and outdoor activities.

Double Zipper & 3 Pockets: The water bag is divided into three layers, one for the hydration bladder bag and the other two pockets for you to store your belongings such as mobile phones, wallets, and keys. There is a mesh bag outside for portable towels, which provides the best convenience for sports enthusiasts.

Ergonomic Design: The hydration packs with 2L water bladder are lightweight and have low resistance. Blue and gray are suitable for both men and women.