The S'well's double-walled stainless steel construction keeps your cold drinks cold for up to 24 hours, and your hot drinks hot for up to 12. Better still, the design prevents external condensation, so you can toss it in your bag without worrying about how soggy it'll make the rest of your stuff. The wide mouth lets you add an extra ice cube, and the standard size base fits in all the cup-holders that populate your life.