This 17oz thermos flask bottle made of high quality stainless steel. Keeps drinks cold for up to 12 hours. Features 4-layered & vacuum sealed design to make sure you experience zero condensation, Leak-proof silicone loop inside, The opening is wide enough for most ice cubes no awful flavor to ruin original taste of water or drinks, Has a foldable carrying loop on the lip to enable you hang it on your backpacks, It fits just right in most standard-size cup holders, ideal for travel outdoor.