On my Grand trip, I rigged my cat with two coolers running lengthwise between the tubes, one fore and one aft. This is my standard operating procedure on any trip, Grand or not; the coolers were purchased to be the largest ones I could fit in my frame here. I have varnished plywood decking on the back holding dry boxes, rocket boxes, a large mesh bag of river/boat gear, my chair, a canvas bag of canned goods (steel cans of food for late in the trip), and misc. smaller items. Even with my seat, low and on the outside so as not to interfere with the oars, (and also very convenient), also sitting on decking, were small items such as throw bag, personal ammo cans, first aid, and tool/repair kit. Up front, instead of decking, is loop strap land, where I put water jugs, propane tank, metal boxes (though not dry boxes) with beverages in aluminum cans, and dry bags. It is just lucky that a propane tank fits there for me; otherwise it would have been on the back decking. I had a passenger about half the time, who sat on the coolers, or the dry bags, or the dry boxes, either fore or aft (wherever she preferred), but aft for all the big rapids.
16" Aire Cougar