Northwater Barrel CoolerThis insulated Barrel Coolers help keep cold things cold on hot days. Each size works on its own, or with its appropriate Blue Barrel in tandem with the TriBag system to provide the perfect configurations for before, during, and after your trip. Choose the Large for a 60 L Blue Barrel or Small for a 30 L Blue Barrel. " closed cell foam for insulation. Double walled with roll top closures. Seam taped inner lining and insulation are removable for easy