Gel and boveda(s) in the same large container. Refill jar with distilled when needed. You never touch the bovedas, they're continually refilled by vapor from the jar, and they "buffer" the jar's output, boosting or trimming it as necessary. Rock-solid RH is the result, with easy refillability, and you never have to recharge, rotate or even touch the bovedas.
I use 116-quart Sterilite containers ($17) with 1 gel jar and 4 Bovedas, mostly full of cigars. Works perfectly.
If I got a 116-quart cooler, it'd be frightfully-expensive, and would have very thick walls making its exterior size much bigger than the Sterilite. Oh, and it wouldn't be CLEAR like the Sterilite, so I can read the hygro without ever having to open it! Also the Sterilites are stackable, for when your sickness gets worse!
Everyone talks about coolers, but if the room doesn't have big temperature swings, they're unnecessary. Save space and tons of money and go with Sterilite or similar clear plastic containers.