Pretty sure Yeti Hopper Flip 8 would fit nicely in there! The 12 might be too big, that is the one I have but never thought of that. I'll have to check it out tonight.
https://www.yeti.com/en_US/soft-coolers/hopper-flip-8-cooler/18010130003.html
https://www.yeti.com/en_US/soft-coolers/hopper-flip-8-cooler/18010130003.html