FlasKap Madic 6oz Drinking System: Compatible with Most 20oz Tumblers, Mixed Drink Well Attachment, Leak Proof Lid

This cap fits a 30 oz yeti perfectly. It is nice to add as much or as little liquor to your ice/mixer and also helps keep track of how much you’re drinking.

Bought this for a white elephant gift, but ended up getting it back. And I am glad I did. This works effortlessly with my Yeti. It fits a good amount of liquor and you can control how many pumps of the good stuff you want in your drink. It's great for on the go when you want to have a couple of mommy drinks, but don't want to tow around a giant bottle. The best part is you can't be spotted by the fun police. This does not seal the cup, so turning it upside down or laying sideways in the cooler.

I haven't used this one yet to verify it works but I have another one and it works great.

This product works well exactly as advertised but is AWFUL to wash. Love the product, but any remaining fluid after washing is super hard to get the last bit out

Great idea for a party or lake or pool day. It is easy to fill, the size is perfect to hide, the color is great, value is excellent, it is easy to clean and it seals so it doesn’t leak

Great product and the company stands behind it.

This is awesome! Holds quite a bit! You can control how much you put into your drink

Perfect!