The Stanley Classic Half Quart Bottle is the ultimate in durability.Double wall stainless steel unbreakable vacuum insulation will keep coffee hot all day long, day after day.The Classic Half Quart Bottle has a double wall stainless steel cup, easy pour stopper, a rust-proof finish and will fit easily into your bag or backpack.Every Stanley bottle is backed by a lifetime guarantee.In 1913, William Stanley invented the all-steel vacuum bottle.Since then, the Stanley bottle hasn't missed a day of work, a football game, or a trip to the great outdoors.The distinctive Stanley bottle is an American Icon that still works as hard today as it did nearly 100 years ago.Stanley.Built for Life.