The 360 Degrees Vacuum Insulated Stainless Narrow Mouth Bottle (750ml/25oz) keeps your drinks hot or cold in a more durable, outdoors-ready design than your standard thermos flask. Made from Edelstahl 18/8 stainless steel, the Vacuum Insulated Stainless Narrow Mouth Bottle (750ml/25oz) is resistant to dents, punctures, and rust, so it will survive anything you throw at it (or rather, throw it at) in the great outdoors.