The Hydro Flask 21 oz bottle with the Standard Flex Cap is the perfect size for life in Phoenix until it is 100+ degrees and you realize, "oh shoot, I need more water!". It fits easily into a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough agua frio to keep you going for hours without weighing you down. No wonder it's one of Hydro Flask's bestselling water bottles.
Versatile, middle-of-the-road size
TempShieldTM insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
Durable 18/8 Pro-Grade Stainless Steel construction
BPA-Free and Phthalate-Free
Compatible with Standard Mouth Insulated Sport Cap