Hiking, mountain biking, canoeing… No matter what, our double-walled stainless steel thermo bottle from the Gemstone collection will be your reliable companion. It keeps your drink hot or cold for hours due to it’s vacuum insulation. The cap can also be used as a cup, which makes drinking even easier. The 0.75-liter Obsidian bottle is as resistant and durable as stone and timeless like a gem. 18 Hours Hot & 25 Hours Cold.