I've been doing some homework on cooler and ice maintenance.
I tried some rock salt on my last 2 day canoe trip. Not really happy with the results. But if you needed to cool drinks down really fast and consume them in a short period its great. It actually raises the temps over time.
I think alot of folks never really consider keeping their ice on multi day trips cause usually there is a store around every corner. Most just throw hot drinks in a hot cooler and get pissed and think they have a crappy cooler when the ice is gone in a few hours. You just asked that ice to cool down everything and last for days. No sir. The cooler should be primed where it's a cheap or expensive cooler, everything going in it should be as close to frozen as possible. The life of the ice will greatly increase. Another thing I like to do is put food and solid ice in my Icy-tec ( pre-yeti ) cooler, it was about $350 years ago. Drinks in a cheap cooler and supplement ice from the good cooler to the drink cooler as needed. Room for 2 coolers pending.
I looked at smaller yetis very hard and decided that it's really not practical unless your spending multiple days in the back country away from town. Which is how often, I mean even on a 26 mile paddle down the edisto i found ice.
For me personally I think the freezer from lowes had more cons than another high dollar cooler. Think about the ice you getting from the store. It's designed to melt period. I mean it's got a freaking hole in the middle, so I am collecting every ice trey I come across and making my own ice. It's cubes are bigger and rock solid to the core. Plus it double as a freezer through out the year. I'll post results of the cube ice Ina cheap cooler on my next trip, I have a feeling that's where it's at.