HYDRO FLASK 18 OZ - Unique double wall insulation protects temperature for up to 24 hours cold and 6 hours hot, Honeycomb Insulation inside lid for additional temperature control, durable pro-grade stainless steel won't retain or transfer flavors, and is tough enough for any adventure, BPA-free so you don't have to worry about your drink altering your genetic make-up. Available in Starfish Athletic Gold, Stone Grey, Pineapple Yellow or Black. Decorated with Hydro Flask mascot and HYDRO FLASK along the bottom on the bottom. Want to customize your bottle? Shop our R-MC stickers!