Here is a handy tool that turns your tumbler into a mug. It lets you handle your drinks more conveniently. The Yeti Rambler Handle lets you lift a 30oz tumbler with one hand. Its open design at the bottom lets you fit your tumbler into most cup holders.
The FinVine Cup Holder Handle is ergonomic and comfortable to hold. It is made of recyclable, BPA free Polypropylene.