Sahara Sailor Hydration Pack Backpack W 2.5 Liter Water Bladder for Hiking, Biking, Running, Walking and Climbing Sahara Sailor hydration pack features military-grade durability which will keep the content of your backpack safe. The shoulder/chest straps are adjustable and comfortable, and make sure it doesn't bounce when you move. 2.5L Hydration Bladder - The hydration pack comes with a built-in 2.5L bladder that will allow you to carry your water conveniently. The high quality bladder is made using EVA material and it's BPA-free, and with a wide screw cap, which makes for easy pouring of water and putting ice inside. Hands-free hydration hose with soft bite valve, gently biting the valve opens up the flow of water. This tactical hydration backpack has a extra pocket that allows you to store your various necessities, like your wallet, keys, phone, or other tools. MOLLE System - 6 rings placed around the backpack for attaching additional pouches and MOLLE gear to the pack. Great for running, hiking, cycling, or biking.