HYDRO FLASK 64 OZ. GROWLER 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 Black or White. Decorated with Hydro Flask mascot and HYDRO FLASK along the bottom on the bottom. Want to customize your bottle? Shop our R-MC stickers!