These high-quality neoprene tumbler holders are perfect for most 24-30 oz tumblers and blender bottles/shakers. Fits wonderfully on Yeti and Rtic tumblers. Max size is 30 oz. These are also perfect for large restaurant-style disposable cups or gas station big cups to keep your cup from leaving a wet mess in your car or on your office desk. The coolest feature is the handle has a small pocket for holding your sunblock stick, chapstick, bottle opener, straw, pen, or keys.