Our 64 oz water bottle is a huge. half gallon stainless steel bottle for transporting and storing water and other beverages. A favorite for backpackers and outdoor lovers due to its large size. lightweight non-insulated. single-wall construction and wide mouth. The wide mouth 64 oz bottle fits most backcountry water filters for clean and safe water anywhere. Loop Cap has a stainless steel interior so your favorite beverage never touches plastic. Need an insulated water bottle?