The Hydro Flask 21 oz Standard Mouth is your perfect go-anywhere companion that can be stashed easily in a small shoulder bag, side pocket of your pack or a car cup holder. Due to its size and versatility these are one of the best-selling vacuum insulated water bottles. The TempShieldTM double-wall vacuum insulation keeps your tea or coffee hot up to 12 hours and your cold beverages icy for up to 24. It is made of durable 18/8 Pro-Grade Stainless Steel construction and is BPA-Free and Phthalate-Free.
