Finding a good hip flask is a relatively easy task. But finding one that can stand up to the punishment of outdoor adventure is a different story entirely. But it's familiar territory for the 8-ounce Stanley Master Unbreakable Hip Flask. This beautiful vessel is built from black powder-coated cold-rolled steel that's both dishwasher safe and tough enough for life on the trails. Better still, it's BPA-free, leakproof, and features internal threading for easier swig-ability. In fact, Stanley is so confident in the quality and performance of this flask that they've offered up a lifetime warranty on it.