Apologies, don't read too good and this was fukken wordy

the lid is crucial for insulation for yetis. Test again with lids on both and report back for science? I am curious because I have always been satisfied with yeti, besides the price tag. Always looking for other vacuum insulated cups and such because from what I understand that's what really helps. Found some vacuum insulated cups but the base isn't vacuumed, so they float upside down when submerged, and they don't work as well because of that air bubble but still work okay.