Fewer refills = better hydration—all thanks to the Owala 40oz Tumbler. But this is no ordinary insulated cup. It also has an awesome 2-in-1, sip-or-swig lid. The Owala Tumbler fits easily into most cup holders, making it the perfect car companion. Like seriously splash-resistant.Fewer refills = better hydration—all thanks to the Owala 40oz Tumbler. But this is no ordinary insulated cup. It also has an awesome 2-in-1, sip-or-swig lid. Another handy feature? The Owala Tumbler fits easily into most cup holders, making it the perfect car companion.