Picture of Duct Tape knife sheath
It's my first instructables.  When I see the Duct Tape Tough Contest, I know that it was time to make my first.
It's a simple and useful instructables.  If you have more then one knife in your drawer, you might need this if you want to keep your edge sharp.  You can also use a knife block, but I don't like this alternative because it take to much space on my workspace.
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Step 1: Materials and tools

Picture of Materials and tools
For this instructable, you will need:
-Knife that need a new sheath
-Old box of frozen pizza (or any other kind of cardboard)
-Duct Tape
-Pen or pencil
-Rulers or measuring tape (rulers work best)

-Electrical tape

Step 2: Trace your blade

Picture of Trace your blade
Trace a rectangle over your blade.  You can add 1/8" to 1/4" on the height so that your blade will fit easily.
After that, you add another rectangle of the same size over the first.
To complete, you add a third rectangle the same length of the blade but only 1/2" high over the last rectangle and a last rectangle the height of the blade on the side of the first rectangle.
If it's not clear, just look at the picture, they will explain it better than me (a picture is worth a thousand words).

Step 3: Cutting

Picture of Cutting
You just have to cut the cardboard along the exterior line.
Again this time, the picture make it clear.

Step 4: Folding

Picture of Folding
For this step, you fold the cardboard on the remaining line.

You start by folding the second big rectangle over the first.
After you can fold the two last rectangle over to make something like a box with only one opening.