Keep a whopping 40 ounces of water locked in with this colossal leakproof travel straw mug. Built with a quick-flip straw lid and comfortable handle, staying hydrated on the go is not a problem. Plus, you can trust it to keep your pack dry, your gear safe, and your front seat spill free. Just fill it up, twist it closed, flip down the straw, and toss it anywhere. And with several possible lid positions, it's great for righties and lefties. Like the rest of the Rambler® Drinkware lineup, this mug is over-engineered and double-wall vacuum insulated to keep your drink cold until the last sip. Plus, the mug and lid are dishwasher safe for easy cleaning.