MJ4 are leading quality cardboard capacity mailers in our MailJacket™ range, they’re completely unbranded and are popular for mailing large books, large photo prints and other items of similar sizes. We offer them in boxes of 100. Constructed from 400 gsm 100% recycled card these envelopes feature pre creased capacity grooves that allow them to expand. This means they can be used for items of many different sizes always with a snug fit to prevent damage caused by in-pack movement during transit. Our cardboard mailers have become market leading because they are high quality and create greater efficiency. This packing process is faster, because you use the wider edge to slide the item into the smooth cardboard interiors, then quickly close with a peel and seal closure. Start saving today by ordering now. To try these envelopes before you purchase them, order free samples and if you have any questions or need any help please contact us.