Review on Ultimate 8-Piece Set: Yeti Straw Lid, No Leak Sliding Closure, 100% Spill Proof - Fits Yeti Rambler, Ozark Trail Cup & More Stainless Steel Mugs by Keegan Hillyer

These are the cute little lids I bought for my 30oz Yeti. The sliding lid fits very well and I can turn the mug upside down without a drip coming out. Unfortunately, the same does not apply to the straw cover. As soon as you tilt the cup slightly and the water touches the rim, the water will start to flow out. It's sad because I bought the lids in the first place because of the straw lid and because the straws aren't slanted it's difficult to get that first drink without tipping the mug a bit and as soon as you do it leaks. Every other item it comes with is great and if there wasn't an item I actually bought that didn't meet my expectations this would be a 5 star item. Maybe I just got a broken cap, but it definitely doesn't seal.