Ello Ogden Ceramic Travel Mug with Splash-Resistant Slider Lid and Protective Silicone Boot, Perfect for Coffee or Tea, BPA Free, Dishwasher Safe, Gray, 16 oz, 758-0438-040

This ceramic Ello is the best of the rather pitiful options I've found. The lid inserts rather than screws on, and I've found that I can adjust the lid slide to allow sipping without leaves coming through for the most part. It's far from perfect, but it's better than spitting leaves with every drink.