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.