These are never used usps priority/flate rate "The Amazing Spider Man" promotional shipping boxes. 11.8x3.3x13.6. These boxes CANNOT be used to legally ship with the usps. I am not a usps authorized service member and these boxes are for collection purposes only!!!!! This item is not a poster. It is a usps shipping box. The item is only described as poster because ebay does not have a option for usps box. If you have any questions or concerns please feel free to reach out to us. Thank you!