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Like a accordion kinda. Hard ends soft body. Could just use to squares of cutting board and squish a drybag lol but that's not cool. I was thinking (yeah not good) to have a beer can crusher looking mechanism inside the lid of a big ammo can so yo could crank on the lever action of the lid to squish shit then it folded out of the way? Yeah iam not much of an engineer lol. I frigging hate smelly garbage. Best to just have none!! No help at all sorry!
What about something like this, just bigger? The bottom could be hard mesh plastic like a dog kennel flooring, and the straps could be heavier duty NRS type cam straps.
My preference on overnighter trips is what we have dubbed the "dungbeetle". We utilize a roller of plastic wrap made for wrapping furniture for moving. Before we leave camp, the last thing we do is compress the garbage int the bag as best as possible, then two people begin wrapping the garbage bag with the plastic wrap. 5 minutes later you have a water tight, compressed, ball of trash. No leaks, smells, and can stuff in any nook an cranny. Bocci ball loser takes all the dung rolls to the dump after the trip.