Update: A partial fix to the stronghold lid issue.

I’m not the only one who thinks Yeti really missed the mark on this lid. It’s sluggish and I don’t like the design of the mouthpiece. Thank you to u/EntityOfHostility who suggested that there may be more to it than just the shape of the mouthpiece and it might be vapor locked somehow. I opened up my other lids to compare and, sure enough, this lid is very much lacking in adequate vent holes.

Husband drilled two holes like the other lids and it did make a difference! For some reason my mouth doesn’t conform well to the shape of this lid over the others, so it’s easy to spill liquid on myself while I’m drinking. But otherwise, it’s still completely spill proof.