Keep your documents clean and pristine and avoid costly transportation delays with Labelmaster’s Heavy Duty Vinyl Document Envelopes. These protect important invoices and shipping papers from damage caused by dirt or moisture. They feature a tamper-evident storage pocket that must be torn or cut open to retrieve the contents. Their pressure-sensitive adhesive sticks to just about any kind of shipping container. Back loading shipping envelopes are a smart and economical way to keep your transportation documents intact.