Bluwing2 Pack 30oz Tumbler Lid, Spill Proof Replacement Lids Covers for YETI Rambler, Ozark Trail, Old Style Rtic Coffee Tumbler and More

This lid should have a tiny hole for liquid flow like you’ve seen other lids have. Without that tiny hole, every time I put the lid on, the pressure pushes the lid up so you keep having to push it back down. I also think the drinking hole should be a little bigger.

These are great tumbler lids. In many ways they are better than the lids that came with the tumblers. They fit several different 30 oz tumblers of different brands perfectly. They contain liquids much better than the original lids. The sliding piece over the opening is fantastic. It keeps drinks from splashing out even when jostled pretty heavily. The gasket ring also creates an excellent seal, preventing liquid from spilling. The only thing about these which isn't ideal is the contoured drinking "spout". The lid has a protruding lip on it where the opening is and it's kind of awkward especially at first. It isn't a big deal but it's just a little odd and not what I'm used to.