None of these are plug-in suggestions, they're all coolers.
I do not have a plug-in, sorry. So, like others, I'll make comments on regular coolers instead, lol.
- I will not buy a cooler without wheels. It's not the cooler weight I'm worried about, it's all the stuff I put in it. I am done breaking my back to take a cooler camping.
- I will not buy a cooler without a drain plug. Unpacking to get rid of water is a pain, and it incentivizes not filling with enough ice to make it easier. Just no.
- I have had several coolers, mostly Colemans and Igloos, and used fancy ones others bring like Yeti's, Pelican's and the like. I'm not saying there's zero difference in ice retention, but when you get above soft sided stuff and lunch coolers, and into the hard sided sizable camping coolers, they're all similar and pretty good. As Swattie said, most ice is lost on cooling it down. The night before, pack drinks n food first, then fill with ice. Morning of, drain, and stop at a station and top off ice en route to destination, to the point you have to remove some to close the lid. You're good for about 4-5 days, 3-4 if you drain cold water daily, but I usually stop and get an extra bag during my travels at some point.
I believe my current one is a Coleman Xtreme, and I got it in 2018 after divorce since the ex took my old cooler. Works fine. The roto molded stuff is bombproof, and the hinges and stuff are usually made better, but it's crazy expensive and for my purposes, not really any better at what it does.