Colderr Handle for YETI Rambler 30 oz. Tumbler, Black This is the best fitting yeti cup handle on the market (some of our competitors fit at the top but not the bottom). Fits Most 30 OZ Tumblers (Yeti, Colderr, Big Boss, Thermik, Etc). Makes Your Stainless Tumbler Easy to Hold. Stays on the Cup and Doesn't Fall Off! Five Great Colors & BPA Free.