first you flatten out your plastic bag......

you then fold it in half...the long way....

you fold it in half the long way one more time.....

you fold the tip on either corner down...to make a sideways triangle

you now turn it around...so it should look like this..

you now bring down the long rectangle area to make it look like this....( did that make sence??)

you do that step again...so it should look like this now

and one more time.....

one last time....

ok this is kinda hard.....the last flap you folded...you put it under the first triangle flap

and finally you just tuck in the excess plastic anywhere in the back.