Tenvolope M-Folder Peel Seal Postal Mailing Cardboard Envelope Boxes M1 M2 M3 M4
Product Type: High Quality Eco-Friendly Exandable M-Envelopes (also known as M-Folders) - Can be used as envelopes, expandable envelopes, or peel and seal boxes. They can be expanded 'in between' these as much as needed.