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I got tired of finding old boxes or other things to protect the hatch carpet when I needed to haul dirty or potentially problem parts in my Vette. I normally have a divider installed, so rather take it out, I made up this box for most stuff and calculated a larger size in case for use without the divider.
You can also make one for the hatch area from a 40 x 48 cardboard sheet that's used on standard size shipping pallets. Just slit the corners and bend up 2" legs on the 40" sides and 3.5" on the 48" ends. You end up with a 36 x 41 bottom that fits perfectly on the hatch floor and won't slide around. You can use an everyday paper stapler to hold the corner tabs in place, since they'll never have much stress.