1.No more messy spills: These spill stoppers for cups let you enjoy your drinks without any mess or hassle. They work with 40 oz and 30 oz stemmed s and have a tight fit over the spout. 2.Helpful and useful: These leak stoppers for cups are perfect for sealing the straws and keeping your drinks secure. They are easy and convenient to use, just put them into the straw and enjoy your drink without any mess. 3.Easy installation spill stoppers: These spill stoppers are small and lightweight, so you can carry them anywhere you go. They fit snugly on your cups or s and keep your drinks from spilling or leaking. They are convenient for offices, home, travel and more. 4.Carry easily: Our spill stoppers are the ideal accessory for your cups. They are lightweight, compact and easy to carry, and they fit most standard cups securely. They are the way to enjoy your drinks without any messes or accidents. 5.Stylish: No matter what cup size and shape you have, our cup leak stoppers can work with both straw and sip.