This ingenious design featured in Family Fun Magazine in 2007 will work with half gallon milk cartons or juice cartons that have the spout and cap. I've gotten to the point that I will buy a particular brand (carton graphics) because I know it will make a great wallet!

For a larger version (checkbook) of this wallet see the link below:
https://www.instructables.com/id/Milk-Carton-Checkb...

Step 1: How to Repurpose a Milk Carton to Make a Wallet

You will need:

A rinsed milk carton
Template
Scissors
Pen
Scribe or awl
Straight edge/Metal ruler
Exacto knife

milk_carton_wallet_template.pdf
Download

Step 2: Trace the Template

Trace the template on the back of the milk carton. Make sure to line up the spout hole. Make marks where the dotted lines meet the edge of the template.

Step 3: Score the Dotted Lines

Using a straight edge and an awl or a scribe tool, score the horizontal line that bisects the two half circles. Then score the other dotted lines.

Step 4: Cut Out Circle

Using a craft knife carefully cut out the lower circle.

Step 5: Cut Out Milk Carton

Cut along the solid outside lines.

Step 6: Fold Scored Lines

Carefully fold the half circles like a fan. It's a little tricky near the spout hole because you have to compete with the original folds of the milk carton.

Step 7: Fold Over

Fold over the flap and line up the cut out hole with the spout hole. If you have trouble screwing on the cap you may need to cut/make the hole a little bigger.