The Hydro Flask 18oz Wide Mouth is a great mid-size water stainless steel water bottle for a variety of activities. Whether you're in the Arizona summer or the Alaskan winter, Hydro Flask's 18/8 stainless steel double wall vacuum insulation will keep drinks icy cold for up to 24 hours and hot liquids hot for up to 12 hours. The wide mouth opening is makes pouring easy, and the BPA-free PP#5 flat cap is insulated to further protect your beverage from outside temperatures. Hydro Flask's 18/8 food-grade stainless steel interior is non-porous, with rounded corners to help eliminate bacteria buildup, unwanted odors and lingering flavors. Along with high performing and high quality products, all Hydro Flask products are made with recyclable materials and are backed by our lifetime warranty. Look for the H-guy and Hydro Flask logo to ensure you're getting the market's premium insulating beverage bottle.