I am not a plastic bag

Step 2 Just like the one from Sainsburys, or nearly anyway

This is really simple. Just write your chosen witty message in your neatest printed (not joined up) handwriting. Wait a sec for it to dry and iron over it to fix it. The original designer Anya Hindmarch bag had "I am not a plastic bag" in a fancy font (see the photo)and the Sainsburys one said "I am not a plastic bag either" in very plain writing.