Recycled Coroplast Storage Box

Introduction: Recycled Coroplast Storage Box

About: I have too many projects going on to know where all the little cuts and scratches on my hands come from. Follow me here to catch up on my latest builds.

This instructable will show you how to make a storage box that is extremely strong and durable. I've seen the post office use coroplast boxes with a wire frame but I thought I'd try my hand at a smaller frameless option. This cost me a grand total of nothing! Free.99! Nada! Zilch!


- Coroplast, I use a 2'x2' piece but this process can be adapted to pretty much any size piece. My city has a art competition every year and the coordinators were happy to give me the signs after they were used. I'm always on the look out for spare coroplast pieces.

- Bolts, I have several boxes of miscellaneous bolts. If you don't have this luxury it should cost a couple of bucks.


- Marker

- Straightedge/T-square

- Drill and drilling bits

- A wooden cooking spoon

Step 1: Plan the Folds

1. Decide what size box you are going to make. For my box I decided the most efficient use of the 2'x2' area would be to have 6'' sides all around with a 1'x1' area.

2. Take the T-square and mark the vertical and horizontal lines.

3. Be careful with marking the diagonals as shown in the second piece, if they are off by too much the box will fold poorly.

Step 2: Crease and Fold

The one weird trick to working with coroplast, use a wooden spatula. I've tried many different tools but these seem to work the best for creasing since the long handle allows you to put your weight into it.

1. Prepare the lines for folding by creasing them with a wooden spoon. When creasing perpendicular to the corrugations it may be easier to heat it up with a hair dryer, this will soften the plastic.

2. Carefully fold the newly creased piece until it has a nice flexible hinge.

Step 3: Drilling the Holes and Making the Handle

1. Fold the corners and make sure everything is lined up will

2. Drill 4 holes about 3/4 of an inch down from the top on each side, space them out so two holes are in every triangle at the corner.

3. Below the holes make a handle buy cutting out 3 sides of it and folding the fourth side up towards the top.

4. Fold the freshly cut handle completely over and use the previous hole as a guide for drilling it out.

Step 4: Bolt It Together and Use It!

This last step is pretty self explanatory but here we go.

1. Put bolts throughout the wholes and tighten them down snug. They don't need to be as tight as possible, just a couple of turns past finger tight is plenty.

2. Fill with your stuff and get organized!

I tested my box out by immediately filling it with the heavy stuff I could find on my workbench. I got 48.6 pounds of wrenches, hammers, and hatchets in there and it held up wonderfully.

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    5 Discussions


    5 years ago

    I would suggest chicago screws instead of bolts and open nuts.


    Reply 5 years ago on Introduction

    I've been wondering what those things were called and now I know, thanks! I would use chicago screws if I had them but I just used the bolts I had on hand.


    5 years ago on Introduction

    This is really neat, and it's one of those "why didn't I think of that?" things. I've seen boxes like that at the Post Office and in other businesses all of my life, and never really thought to grab those ugly political signs and such after elections for this purpose.

    Great job! Very motivating, and it has a great ecological benefit in getting rid of and repurposing those millions of voting signs.


    Reply 5 years ago on Introduction

    Thank you! I've been toying with this material for a while and use it in a lot of projects. Coroplast easy to use, often found for free, lightweight, and strong!

    I'm really excited to see what other people make out of recycled signs once they learn it can be repurposed.