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 Jessica Lawson

I was disappointed that none of these caps fit my 30 oz Yeti properly. The problem is the rubber O-ring. The material is too thin. This will lead to leaks if care is not taken. Also, these caps degrade the insulating properties of my 30 ounce Yeti. I replaced the o-ring in this product with a genuine Yeti o-ring and the fit is much more secure. However, I didn't buy these lids to combine with what I already had. The straws are well made and easy to clean. . Also, I do not recommend this product.