LUOLAO Silicone Spill Stopper Compatible with YETI Straw Cup, Mug Tumbler Accessories Including 2 Straw Cover Topper Cap, 2 Leak Proof Stopper

Great product, keeps liquid inside if you use it correctly. Also keeps air in, so when you push lid on be careful of "fountain" coming up through straw. But I use it every day and works great!

Creates a very slight vacume when drinking due to the seal it provides. However it almost completely eliminates any spillage when on it's side. (3 drops over 5min vs half the cup in the same time). I am very happy with this product and if you like the yeti straws and are active, is a great addition to your yeti.

These things work great. I didn't use the stopper around the lid. But the cover for the straw is perfect.

I love my straw cup and I think I drink more water vs a regular water bottle or cup which is helpful but having an open straw carried with me everywhere kind grosses me out. This completely changes that.First, these fit my yeti lid and straw perfectly. It’s not a pain to shove the grommet in the lid and it comes out easily while still maintaining being leakproof and that also helps a lot with cleaning which is super easy with just a little bit of soap and water.The quality seems high for how little I paid for the two pack so it was a good deal.My only issue is that if you do not have the straw covered when you put the lid on, the pressure from pushing the lid down makes water shoot out of the straw. Put the straw cover on and press slowly to let it equalize!

these fixed the only thing i absolutely hated about my reduce brand 50oz cup! i didn’t really read too many reviews before purchase so when the water shot up in my face i was a bit surprised but i saw this little divot in the lid (first pic without stopper) i decided to risk the $6 and cut into one just to give the tiniest amount of breathing room for it to not squeak or erupt when i’m filling it up in the office and that did the trick! the straw still stays completely in place and has a snug fit and virtually no leaks i knocked it over on a grey shirt to try and show that lol. i saw people drilling holes into their lids too which is another way they got it to not be crazy air tight where it does those things but luckily for me it already had the little pre etched bit. wanted to put this out there for anyone else needing the quick fix!