hydro flask standard mouth water bottle, flex cap - 18 oz, watermelon hydro flask with the hydro flask standard mouth insulated water bottle with flex cap, you can count on ice in the forecast. staying hydrated is easy when you’ve got this portable thirst-quenching travel buddy. whether you’re headed to the gym or a quick jaunt across town, you can easily take your refreshment with you in this metal water bottle. the tempshield double-wall vacuum insulation will keep cold liquids chilled for up to 24 hours, while hot liquids remain hot for up to 12 hours. the standard mouth opening is large enough to fit most ice cubes but small enough to sip from on the go. this stainless steel water bottle is large enough to hold water for the day, yet it fits easily into a backpack, gym bag or car cup holder. durable 18/8 stainless steel keeps your favorite beverage fresh and pure, without any leftover flavors or odors. make our new dishwasher safe water bottles a part of your hydro flask collection. the new powder coating can keep its color and grip through every wash and rinse. this hydro flask product is backed by a manufacturer's lifetime warranty.