You will need; a junk credit card (or similar sized piece of plastic), duct tape, a permanent marker, a ruler, scissors, a place to hold tape (pocket will do but altoids taste better) and a brain.
Step 2: Mark card
use the sharpie to mark the card. First mark the card so that it will be able to fit into its destination. then mark a one cm strip on each side of the card. Next mark the centre of the card and mark to 1.5 cm strips above and belove the centre point horizonatly.
Step 3: Chop Chop Chop
Insert your index finger into lower hole of cutting tool, insert thumb into upper hole of cutting tool. By slighty opening and closing your fingers a cutting action can be achieved. Use this action to cut along the lines from step 2.
Step 4: Wrap up
Take the roll of tape and unroll a long section place the midsection of the card on and roller up. Repeat as necessary.
Step 5: You're Done
Put the tape into the container and always be prepared. You could add this to an altoids wallet or any other of the millions of altoids projects on this site.