Upgraded 6Pcs Silicone Spill Proof Stopper Set, Accessories for Stanley Cup 1.0/H2.0 Tumbler 20oz/30oz/40oz, Straw Cover Cap for Stanley, Square Spill Stopper, Round Leak Stopper for Stanley

I love my Stanley tumbler but have never been a fan of how badly it leaks, especially with a toddler on the house. These seals work really nice to help to keep a good deal on the openings and leaky bits, and as long as you don’t move the straw much they stay in place well. Good little seals!

These lids are perfect for your cups! Definitely spill proof! Will be ordering more for sure!

The description indicates these pieces fit a 40oz Stanley tumbler. The piece that goes on the spout of the lid for the straw to go through fits VERY loosely and does nothing for spill protection. If the straw moves up or down even a little, which is the majority of the opening on the lid causing leaking. This defeats the purpose of having the other two pieces ( the straw cap and the round piece going on the underside of the lid ). Will be buying replacement Stanley cup brand lid from Stanley website due to this experience. Highly recommend not wasting your money.

Does what they're intended to do. Fits my bottle perfectly

My 5 year old was able to use this very well. I got it so her cups would basically have some sort of leak proof. She didn’t make any messes when she dropped her sup and the parts are easy to put on and stay on. I really liked it for her tumbler and straws. I’d recommend I like how they are also plain white/clear looking. Easy to clean and keep reusing and it matches all her cups ! Delivery was also fast

Perfect for my Stanley cupsOne of my cups is the older version and leaks like crazy, but not anymore! My daughter's latest version of the cups also had a bit of leaking issue and this set fits them both perfectly. It took a little while to put them on, but once on, my stanley cups are now 100% leak proof!

I am really clumsy when it comes to cups so I have to have tops on them. But they still spill. I got these toppers and put them on my Stanley cup and it doesn't leak. It took me a few minutes to get them on but they work perfectly. I've already recommended them!!