These box shelves are a shelving solution for commonly sized boxes like bankers boxes as well as boxes used to package reams of paper in copy stores.

Necessity is such a mother. I'm sure others have this same problem. I'm just surprised nothing existed to do this job.

Downsides:

This shelving solution is not intended to be moved while full.

It is also not intended to have heavy boxes at higher than the second shelf.

Upsides:

This solution is comprised of many identical units, each weighing only a few pounds and costing under $4 each for materials.

Each unit connects to the ones next to it in every direction (left, right, above, below), providing more stability.

It is assembled and disassembled all from the front. Kids can help!

The end solution can be any custom shape to fit under tables, mantles, windows, or other architectural objects.

No shelving solution I could find offered me the density and flexibility that this solution offers.

Step 1: You Will Need

MATERIALS:

plywood - 3/8" thick

top           10-1/2" x 20"

doorskin - 1/8" or 1/4" thick

bottom     10-1/2" x 20"

furring strips - 3/4" x 1-1/2" by usually 8' long

out of furring strips, cut the following lengths:

vertical corner supports      10-1/2" - need 4 per box shelf

back brace                          max 21" - need 1 per box shelf (angled cut described later)

side brace                           max 21" - need 1 per box shelf (angled cut described later)

wood screws #6 x 1" - need 12 per box shelf

used to attach vertical supports and braces - 6 pieces, a screw for each end

machine screws #6 x 32 x 1" - need 1 or 2 per box shelf

used to vertically stabilize multi-box shelf system

machine screws #8 x 32 x 2" - need 1 or 2 per box shelf

used to horizontally stabilize multi-box shelf system

TOOLS:

table saw - or capacity to cut top and bottom (some home improvement stores will do this for you at a nominal cost)

miter saw - or capacity to cut supports and braces

electric drill and bits

electric screw driver

sandpaper (optional)

NOTE: 1/8" doorskin is weak but its job here is to hold the vertical supports straight. It does that well while keeping the total box shelf weight down. It isn't strong enough to support the weight of some boxes but in this use, it will be sitting on the floor or on top of another box shelf, which means it will be sitting on top of a piece of 3/8" plywood, which will provide the strength needed to hold the box.

NOTE: I started out using wood screws #6 x 3/4" but moved up to #6 x 1" for a better application

Step 2: Pre-drill Top and Bottom

Pre-drill screw holes in the tops and bottoms for the vertical supports as well as the vertical stabilizer bolts.

Vertical support screw holes -----

The corner holes (pink) for the vertical supports should be centered where the vertical support will go, which is 3/8" in from the side and 3/4" in from the front, outlined in dotted green.

Drill the vertical support holes with a bit that's the diameter of the solid part of the wood screw, smaller than the diameter of the outer edges of the threads.

Vertical stabilizer bolt holes -----

The side holes (purple) are for the vertical stabilizer bolts. Why 8 inches from the front? I just chose a distance that I thought would be easy to reach from the front to assemble and disassemble. I didn't put them right in the front because I felt I could get more stability by placing it along the middle somewhere.

Drill the vertical stabilizer hole as big as possible while being smaller than the head diameter of the machine screws. You'll want as much flexibility for these holes to line up later.

Step 3: Attach Vertical Supports

Using the wood screws, attach the top and bottom to the vertical supports.

Step 4: Cut and Attach Angled Braces

Cut angled braces:

I kluged this part. I took a furring strip that was more than long enough, held it in place as close as I could get it, drew a line where I wanted it cut, and cut it with a miter saw. I then did the same on the other end. Trial and error. There was enough variation in the wood that I had to tweak the back and side braces often during final assembly of the 70 box shelves. Even with good math and better tools and jigs than I had, this part I imagine would still be a fair amount of customization given the low grade materials I was using.

Attach angled braces:

I tried screwing in the wood screws here without pre-drilling but that didn't work so well. So I pre-drilled and then screwed to attach the angled braces. The purple in the image shows where the screws are going inside the wood. Only the heads are visible.

FYI, the back brace came from some scrap furring strip that was partially painted white.

Step 5: Drill Holes for Horizontal Stabilizer Bolts

I don't have access to a drill press and so I kluged this step too. But it worked out really well as long as I remembered to keep the drill perpendicular to the surface as I drilled. I made a template using a vertical support. I centered the desired hole from left to right and measured down 7/8". Why not an inch? I don't know. Maybe the woodgrain pushed it up. Then I held that template to the front vertical supports of the finished box shelf and drilled the two holes.

Note: Are these screws or bolts? They're called machine screws but they come with nuts, which means bolts to me.

Step 6: Sand

You may want to do a quick sand with #100 to minimize splinters as you install these shelves. I started out sanding everything in the beginning before assembly but when I saw how much time it was going to take to sand 70 of these shelves, I did a very light sanding at the end where needed.

Step 7: Assemble Multiple Box Shelves

As you assemble multiple box shelves together, add the stabilizer bolts horizontally and vertically.

Load them with your stuff. Get to everything instantly!

Step 8: 11 Year Evaluation

I am now revisiting this Instructable to make a bunch more as a contribution to a community arts organization I want to support.

I have been using these for over 11 years and they have performed even better than I had imagined!

I have moved with them at least three times. They were easy to take down and set back up in the new location. I only took them down to two of the single shelf units bolted together.

I have always used them in arrangements of at least two and usually more shelves across and four to six shelves high. I found them very stable that way. Instead of using most of the stabilizer bolts, I wrap every other or third pair with velcro.

This time around I have a friend who has a shop with a table saw and a drill press. It won't take me so long this time.