Size 278 (MJ278) MailJacket™ cardboard capacity mailers are ideal for mailing books and flat packages and boxes. They’re completely unbranded and come in boxes of 100. Using MailJacket™ will ensure more of the products you send qualify for reduced cost delivery options, such as Royal Mail’s large letter, lowering your company’s overall postal costs. The 400 gsm 100% recycled card envelopes include pre creased capacity grooves that allow them to expand, This means they can be used for items of many different sizes and ensure a tight fit preventing damage in transit for all of them. MailJacket™ cardboard capacity mailers have become the market leading product due to their quality and efficiency. This is because items are inserted on the long edge, they glide across the smooth cardboard interiors and are quickly secured with a peel and seal closure. Begin to save time and money by ordering now. You can also try before you buy by ordering free samples. If you have any questions or need any help then please contact us.