A flask kind of speaks for itself. This one has a slightly outdoorsy feel, so it makes a great gift for the would-be adventurer. Or the very thirsty. It's made of stainless steel that's leakproof, dishwasher-safe, and BPA-free, with a handy, wide mouth that's easy to fill (no funnel needed) and a lanyard-top cap that's impossible to lose. Please check your local open-container laws before going crazy.