I put my 50 2.5 squares together on a sheet of cardboard. I then warpped them in saranwrap and made sure the air was out of it. I put them in an envelope and took one to my local post office. I was told it would cost 86 cents to mail one. One reason is because of what is in it. She said since it was fabric it should not go through the machine, (which I agree with). Seems like some of us on the board get different answers from different post offices. I took these pictures the best I could to show how thin they are. Just wanted to let you all know. I am sure others will have different experiences.