A Clear Winner with 40% Lower Profile Physics, Times Two! The endurance enthusiasts dream double pack with the sleek bounce-free low profile performance of Amphipod's technology now with a full 40+ ounces. Includes dual easy-access 20 oz. low-profile Hydraform bottles. Ample space for fuel and gear with an extra-large cargo area, zippered quick-access pocket and compression bungee for jacket, gloves and hat. BPA free.