For my eagle project I built these cubbies fit for 18 gallon totes for a clothing bank so the totes containing out of season clothing weren't stacked dangerously on top of one another. This is what I came up with
Step 1: Cutting
I used an 8 inch table saw to cut all my wood, all you need is several 2x4's. mine stood 7.5 feet tall and could fit 4 totes high. Just remember however many totes you want it to be wide, add an extra support at the end. So if I wanted it 4 high and 3 wide, I would need: 12 7.5ft 2x4's 8 48 in. 2x4's 16 21' pieces.
Step 2: Put Together
Or stain....you don't have to stain, it jut looks better! you place the first 21in board 18 inches off the ground and the next 21in 19.5 inches up ect. You should make something that looks like this
Step 3: Assemble
You may need more than one set of hands for this...what I did was put pieces of scrap that were the exact length(the bright yellow) boards for the perfect spacing every time. I used 2.5 inch screws for this assembly. Enjoy!!