This Insulated Cooler Bag holds 2-2.5 Liter water bladder perfectly by protecting it against any damage.Insulated material keeps water cool for a few hours in hot summer or keeps your water from freezing in winter.Perfect for cycling backpacking hiking camping marathon kayaking biking mountaineering skiing and snowboarding etc. Features: Made of polyester material for outer cover durable to use. Premium insulated material inside keeps water cool for a few hours in hot summer or keeps your water from freezing in winter. It holds 2-2.5 Liter water bladder perfectly by protecting it against any damage. It can be used for more than just a water bladder such as cold drinks food snacks water bottles water pouch etc. Wide opening mouth with fastener tape easy to get your water bladder(not included) or add ice into bag. Convenient handles to easily carry it out or keep bag in place on your backpack. Perfect for cycling backpacking hiking camping marathon kayaking biking mountaineering skiing and snowboarding etc. NOTE: insulation effect of this water bag is same as ordinary insulated lunch bag. It just can do temporary insulation due to general insulation effect. Specification: Color: Black/Army Green/Khaki/Camouflage (optional) Material: Polyester Size: 44*20cm/17.3*7.9in Weight: Approx. 100g/3.5oz Package List: 1* Insulated Cooler Bag