I've always hated digging in the bottom of my barrels to get my "kitchen" crap on canoe trips. Simple solution was to build a Wannigan.
Bottom and ends are made of laminated 3/4" pine and cedar. Sides are 1/4" birch plywood. Width was designed to hold the rubber dish tray (just under 13"). Oddly enough I'd sooner boil up some water and wash dishes in the bucket as opposed to in the river.
Removable trays installed for extra storage and easy access to small items.
Top is made of 1/2" poplar plywood, edged with butternut. Checker board added for the kids. The box itself works as a seat or a small camp table.
I'll be adding weather stripping to the underside of the lid, should be somewhat water tight but we'll see.