The Outdoor Products 2 Liter Insulated Gel Reservoir offers a durable and convenient way to keep a variety of items cool at home, outdoors or on the job. This reservoir bladder features a quilted back that helps to keep the contained gel evenly distributed, allowing for a thorough freezing and more effective cooling. Additionally, this backpack reservoir is capable of staying cold for up to four hours, and it does not dilute liquids or leave puddles as ice does. A full gel bladder can be easily stored in the refrigerator for short term cooling, or empty the bladder and place it in the freezer to optimize the cooling properties of the gel. The hydration reservoir has a quick release detachable reservoir hose. This makes cleaning a breeze so you can spend less time washing and more time adventuring. The flat wide cap with tether allows for ease in filing with ice and water. This is great to add to your Outdoor Products Hydration compatible backpack. This item is BPA-free. The dimension are 9.5" x 2.0" x 7.75".