Bomber and incredibly lightweight (255 gm), this vacuum-insulated bottle provides 12 hours heat and 24 hours cold retention while being 1/3 lighter than traditional designs. Super thin walls are actually thinner than most single wall plastic bottles for an amazingly compact footprint that fits anywhere. 18/8 stainless steel boasts unrivaled purity and durability Secure, screw top cap includes leverage enhancing lobe which makes opening easy with cold hands. Leash provides convenient attachment point.