The Hydro Flask 21 oz Standard Mouth Bottle with Flex Sip™ Lid is your perfect travel companion. It stashes easily into a small shoulder bag, your pack's side pocket, or your car cup holder, and holds enough ice-cold goodness to keep you going for hours without weighing you down. Its TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. The Hydro Flask 21 oz Standard Mouth Bottle with Flex Sip™ Lid is ready for whatever your adventure brings.