The hydration tank you never knew you needed. The Owala FreeSip® 40 ounce Stainless Steel Water Bottle is a beast-whether you're on a hike, road trip, or just avoid refills like the plague, it holds enough icy cold water to last all day (literally). Just a warning: with the same genius sip-or-swig lid and leakproof design, your friends will ask to borrow it. You can be selfish this one time.