Miracol 14L tactical hydration backpack comes with a 2L BPA-free food-grade water bladder with a large 3.4" opening, which is put in an upgraded insulated compartment to keep your water cool for a minimum of 4 hours. 4 zippered compartments of different sizes and functions will assure you of ample space for your belongings. Meeting your day-long hydration needs and storage needs, this military hydration pack will be the most reliable companion for you, great for hiking, cycling, camping, climbing or being used as a daily backpack.Miracol tactical backpack features low-profile and ergonomic designs. It contours closely to the body to reduce shaking and friction while moving for a greater range of movement. Compared with traditional military hydration pack, Miracol hydration backpack centers the weight on your back rather than your shoulders to reduce your burden. The shoulder straps and the back area are filled with highly breathable mesh padding, and the pack's foam and mesh back panel helps you stay cool and dry even on warmer days or under conditions of heavy sweating.- 2L water bladder takes care of your hydration needs. - Thermal insulation keeps water cool for 4 hours at a minimum. - Breathable mesh pads on the back for your maximum comfort. - Pockets of different size for easy access to all the essentials. - 900D Oxford cloth stands up to all kinds of environments. - Multiple breathable and adjustable straps fit your body perfectly.