As a gear editor, I bring home so many water bottles that my girlfriend has enacted a one in, one out policy. It's a shame, but necessary. One bottle that I will never give away, however, is my 32-ounce Hydro Flask. It's a go-to for everything from my morning commute to after-work hikes. Thanks to a stainless steel, double-walled construction, it keeps liquids cold for 24 hours and hot for six. It also has a lifetime warranty, although I doubt I will ever use it. My bottle has floated down rivers in Patagonia, bounced down 14'ers in Colorado, and spent countless hours rolling around the trunk of my car. It's pretty dinged up, but still keeps my water cold and never leaks.