Your will need a peice of A4 printer paper.
Step 1: Step one
Fold over the bottom right corner to meet with the top left hand corner
Step 2: Step Two
Fold in the left corner so it make the side straight (do the same for both sides)
Step 3: Step Three
Fold down the top triange to make that edge straight.
Step 4: Step Four
Fold in the side again so it covers the gap next to the folded down triangle (same for both sides).
But tuck it under the folded triangle and really push down on the folds to make it stronger.
Step 5: Done
You are now done just open it up and you have a bag.
Usefull for money or thin item holding.
This is my first instructable i hope you like it.