Spill Stopper Accessories:Does your straw cup leak? Our leak proof kit is the best solution to your trouble, it keeps your tumbler spill stop Scope of Application:This leak proof stopper is compatible with YETI straw mug: 16 oz / 20 oz / 24 oz / 25 oz / 26 oz / 35 oz Multi-protection:The straw cover topper cap and spill stopper doubly prevent water from spilling, and keep contaminants from getting inside the mug Vent-hole Design:The round leak stopper must have vent-hole to equalize the air pressure, making it easier to drink. Even if the mug is knocked over, only a few drops will come out High Quality Silicone:The spill proof accessories is made of food grade silicone, BPA free, non-toxic. Soft silicone is easy to install and clean Our leak proof kit is the best solution to your trouble, it keeps your tumbler spill stop.This leak proof stopper is compatible with YETI straw mug: 16 oz / 20 oz / 24 oz / 25 oz / 26 oz / 35 oz. The straw cover topper cap and spill stopper doubly prevent water from spilling, and keep contaminants from getting inside the mug.The round leak stopper must have vent-hole to equalize the air pressure, making it easier to drink. Even if the mug is knocked over, only a few drops will come out. The Yeti Straw Cup Spill Stopper can be used in a variety of scenarios. In terms of transportation and travel, when you carry a water cup while driving or riding a bicycle, and when you take a plane or put it in a backpack, it can prevent liquid from leaking due to bumps and other situations. During daily activities and leisure time, such as taking a daily walk, having a picnic, going camping and barbecue, or attending outdoor music festivals, it can not only prevent the liquid in the cup from leaking when being carried, but also keep the drinks clean and avoid insects from falling into them and causing contamination. In sports scenarios, like mountain climbing, rock climbing, hiking and other sports that require carrying a water cup, it can prevent the liquid in the cup from spilling out due to the tilting or shaking of the cup during exercise. All in all, it is suitable for any dynamic environment that may cause the cup to tilt, shake or vibrate, ensuring that the drinks are safe and leak-proof while keeping the surrounding environment clean.