Make sure your shipping documents arrive clean and intact with Back Loading, Blank Envelopes. These packing list envelopes protect invoices and shipping documents from dirt and moisture. The back loading, blank shipping envelopes feature pressure-sensitive adhesive that sticks aggressively to paper, metal, wood, corrugated or plastic. Back loading, blank envelopes form a tamper-evident pocket for papers. The pocket on these packing list envelopes must be torn or cut open to retrieve papers. White Opaque Envelopes prevent see-through.