Keep water locked in with the colossal YETI Rambler 40 oz. Travel Straw Mug. Built with a quick flip straw lid and comfortable handle, staying hydrated on the go is not a problem. Plus, it's 100% leakproof when closed so 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 YETI Rambler drinkware lineup, this mug is overengineered 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. Please note, do not use the Rambler Travel Straw Mug with hot, carbonated or pulp beverages, or for storage of food or perishables.