SPILL and Splash Proof lid with Slider Closure Retractable Sip Hole Cover for 30oz Tumblers including Yeti Rambler & RTIC Tumbler (1) THIS REPLACEMENT LID with retractable sip hole cover is designed for use with most 30 ounce insulated tumbler models including the 30 ounce Yeti Rambler. THE CUSTOM DESIGNED, easy-to-use retractable sip hole cover prevents spills and helps keep your drink insulated longer. THE CONTOURED WIDE mouthed sip hole allows for direct sipping or for use with a straw. CRAFTED FROM DURABLE tritan plastic, this lid is long lasting, dishwasher safe, and 100% BPA Free. THE SIP HOLE COVER is not designed to create a watertight seal and will not prevent leakage if tipped over or held at an improper angle.