Made of polyester material for outer cover,durable to use. Premium insulated material inside keeps the water cool for a few hours in hot summer or keeps your water from freezing in winter. 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 the bag. Convenient handles to easily carry it out or keep the bag in place on your backpack. Perfect for cycling,backpacking,hiking,camping,marathon,kayaking,biking,mountaineering,skiing and snowboarding etc. size: 44 x 20CM Material: Polyester colour: black Package Contents: 1 x Insulated Cooler Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.