Milwaukee 532ml PackOut Black Insulated Mug with Sip LidDouble wall vacuum insulation for all day hot & cold retention.18/8 stainless steel for highest durability.Ergonomic handle for safe and comfortable grip.Dishwasher safe.Lids are compatible throughout all PACKOUT™ bottles and mugs.Twist and lock mechanism for connectivity with all PACKOUT™ components.Part of the PACKOUT™ modular storage system.