What Our Gearhead® Experts Are Saying: "I grabbed the Rift Tumbler Lid as a backup, but it quickly became my go-to upgrade. The twist-lock seal is rock solid—no leaks in my bag—and the sip lid pops open easily with one hand. It’s perfect for replacing a worn lid or adding leakproof confidence to my Nest Mug for daily travel."We know the importance of a reliable seal when we’re fueling up for an early trailhead start or packing coffee for the road. That’s why we trust the VSSL Rift Tumbler Lid. Built from polished Tritan and BPA-free food-grade polymer, it features the brand’s VaultLoc twist-lock system for a secure, leakproof seal no matter where you’re headed. A spring-loaded sip lid opens smoothly with one hand and locks in place while you drink, while the silicone gasket and visual lock indicator ensure a confident, spill-free pour every time.