Size: 249 x 249. All-Board envelopes are 350gsm/500mic heavy-duty white envelopes with hot melt glue on all seams, and finger lift silicon paper strips. Perfect for posting by adding that extra protection. These 249mm square white all board envelopes have a tear strip.
Royal Mail Pip (Pricing in proportion)
This is a very popular large square envelope, as this is the largest square envelope that can now be sent through the Royal Mail postage system classed as a large letter.Large Letter: