This is my version of the bike inner tube wallet. The dimensions are pretty standard, I used my old wallet as a template, it is 7"x4 1/2". Originally I was using white thread but it was to thin and kept breaking, so I ended up using blue which unfortunately blends in with the black. However i didn't want to spend any money on this project which is why I stuck with blue.

Step 1: Tools

These are the only real tools you need. Of course, basic sewing skills would be very useful. Which is probably why my card holder got crooked.

Step 2: Cutting

The first step, after procuring a tube, is to cut it lengthwise. After doing so, the next step is to cut the tube to length. I used my old wallet as a guide while doing this.

Step 3: Sewing

The next step is to get everything ready to sew. I cut three seven inches long strips, then sewed them together at the long edges this makes a sheet twice as long as your wallet is tall. Then we make the card pocket . I took one of my shopping cards and cut a square of inner tube a half inch bigger on each side than the card. Then I cut a hole in the middle so my licence would show. Next sew the pocket on. After the pocket is sewn on you can fold the sheet in half and sew the short ends closed.