I'm glad I asked. I too,bring a( shorter )bucket with lid (2.5-3.0gal.)and fill it with water sensitive or breakable stuff like my camera,stove etc.. It makes a nice table between my knees while paddiing, to place my map cace (tethered and weighted) and a compass.  Your idea to keep your kitchen and lunch in an oder /critter /waterproof stool/ container seems very logical .