Silicone Spill Stopper Set | Compatible With Stanley Cup 2.0 30 40oz | Leak Proof Kit | Tumbler Accessories Including 2*Straw Cover Cap for 10 mm Straws, 2*Spill Stopper, 2* Leak Stopper

These tips prevent spilling very well however material quality is not very good.

I am not 100% happy with it but can’t really explain why. It just feels it doesn’t isolate although it seems to do it.

The stopper is even too small for 30oz, it fits but once you push the straw through it carried the stopper along into the cup. Be warned

It doesn't prevent spillage!

Works like charm. I got this along with a brand new Stanley cup 2.0. The stopper set fits perfectly and stops even a drop! Can’t wait to use without worrying about it spilling :)

I can’t lie this does in fact make your Stanley leak proof, but it also makes it harder to suck the liquid out.

This fit my 2.0 lid well. No more leaks from the center of the lid. The silicone piece that goes over the rectangular sipping hole fits also. However, it is too tight to allow me to use my 10mm glass straw that I normally use with the built in straw hole. Instead I had to use my 8mm stainless steel straw, but it is a little too narrow for the opening. Unfortunately that means that it doesn't stay in place well since it allows for too much movement at the straw opening, which also allows the bottom of the straw to slide around the base of the tumbler - shortening the length of straw that is above the lid. Since it's not a snug fit then water can leak out the straw hole with the straw in it, but it's a MUCH slower leak that before I put the silicone pieces on the lid. Despite the fact that the straw hole won't accommodate my 10mm straw, the straw topper fits it perfectly. But the straw topper is too big to fit the 8mm straw securely.

Thanks seller for a wonderful product. It changes my life. The stopper set fits perfectly and stops every drop. I am scared of spilling my tea no more.

Come fast and fits nicely!