Travel vacuum bottle are made from high quality food grade stainless steel that are safer and lighter than using 8/18 ones or plastic or glass water bottles! It's ultra-light weight and compact. Travel water mug comes with a leak proof, insulated. flip-open lids are designed to release and hold, then flip open. This 2-step lid release allows condensation on the lid gasket to fall back into the mug instead of splattering.