I hear ya. I started using the premium coolers simply because we use coolers so much here. Ice last longer and the cooler lasts longer.
For what its worth and speaking of cost. I bought an Ozark Trail soft cooler for the wife to keep in her trunk. These things are cheap from Walmart but are...
You may not have looked close on the RTIC website. They have multiple units of measure on the cooler specs. I have the 45 and 65. They both measure liquid 45 and 65 quarts and this is noted on the website as well.
Whereas the Yeti Tundra 45 and 65 measure 37 and 52 . One of the reasons i use...