The Milwaukee PackOut Sip Lid is leakproof and disassembles quickly for easy cleaning in the dishwasher. When paired with a PackOut Bottle or Mug, our leakproof Sip Lid provides all-day hot and cold retention. Ergonomic grips allow for a smooth open and close, even with gloved hands. Designed for use with PackOut Insulated Bottles and Mugs. Milwaukee PackOut is the industrys most versatile and durable modular storage system.