HYDRO FLASKA(R) 18 OUNCE WIDE MOUTH BOTTLE :: Sweet. You've found the easy-carry Hydro Flask handle on a smaller bottle! Your Hydro Flask 18 ounce Wide Mouth Bottle makes it effortless to take your hot & cold beverages with you. Keep your hot drinks hot and cold drinks cold thanks to the double wall vacuum insulation. Plus, feel safe and socially responsible because your Hydro Flask bottle is BPA-free, recyclable and backed by a lifetime warranty.