For what it is worth: I would lean towards the boxes egg cartons come in. They are basically 1'x1'x2'. Easy to carry/manage. I used them when I moved. It made loading and unloading quick and easy. However, I think that plastic containers in that size may be more durable, yet more expensive - $$ vs. free.

YMMV

My $.02
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor