How to fold a plastic bag

First you'll need a plastic bag, the size dosen't matter at all! :-)

Then you're gonna fold it like this.

And fold the other one too into the middle.

Then fold the bottom once, just like a triangle.

Fold it normally, like this.

This is what it now would look like.

If the bag is too long, then fold the top normally like a sqaure.

It should now look like this.

Then fold the square into a triangle, just like you did the first time.

Place the "new" triangle into the old one, if you "open" the old triangle you will see that there is a opening to place the "new" triangle.

And here's the final result, simple and it's now more easy to get your plastic bags organized.