Tomato boxes are a nearly ideal size for manila envelopes and file folders.  You can even stack them, put a board across the top, and have an instant desk, as long as you don't try to load it down with a desktop computer and peripherals.  If the mater boxes are clean, they are great for storage of linens and fabric.  Smaller grocery stores will save them, or let you know what time to come and pick them up.

Reminds me that another site had a woman who uses heavy-duty trash bags for space bags.  Bundles and tapes the opening, sucks 'em out with a vacuum  hose.  

Could you link that? I tried a DIY space bag and it didn't work so great. I'd like to see how she's doing that.

Wish I could remember where I saw it.  I get too many e-papers and refuse to relinquish a single one.

I believe she used a rubber band around the neck of the bag to attach it to the vacuum, then duct-taped the neck shut after she popped the bag off the hose. She then taped around the bag to keep it from expanding.  

The small store-bought Space Bags work better than the large ones,and the kind with the turn valve instead of the cap are best. I found out the bad, hard way not to use them for archival storage after they yellowed one of my Thomaston Mills tablecloths I was saving for my niece's heirloom stash.

This boy has the same idea, using a plastic bag and a rubber band:

how to make your own space bags