Our range of Medium Parcel Sized Cardboard Envelopes includes All Board Envelopes, Board Backed Envelopes, MailJacket™ and ColomPac® products. These cardboard envelopes conform to the Royal Mail size specifications for medium parcels. Crafted from lightweight card, you can be sure these envelopes will keep your postal costs low while protecting your items. Our cardboard envelopes are available in white, brown, and manilla, with a range of sizes to suit your specific needs. All of our envelopes feature a handy peel and seal strip for easy packing.