A while back REI had their brand duffels on sale for some % off, I picked up a few for just this application. They are big enough that three of them will carry a lot, and they're all the same size. I think we're on the same page here in that a number of the same size box laid side-by-side creates a platform, but the final decision on how many and what size needs to be made based on specifically what is being packed and vehicle constraints.

More wind today, hopefully unpack tomorrow.