Stanley Classic Vacuum Hammertone Green Bottle insulation keeps drinks hot 24 hours or cold 32 hours. Stainless steel won t rust and is naturally BPA-free. Hammertone powder coat is durable and timeless. Thick outer steel takes a beating and still performs. Wide opening makes it easier to clean ice compatible. The insulated lid doubles as an 8oz/236ml cup. The Classic is leak proof and fully packable.