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

It works good and cool way to sneak in some booze, but hard to clean

Great product! What a fabulous idea. Worked out a little expensive shipping to Australia but absolutely worth every cent. Fits the 24oz Yeti Rambler perfectly!

It does work great, but it doesn't give you one full ounce. You have to press it twice.

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.

As the holes in the console of our car were too small to hold our water flasks this item did the job