THESE PACKING LIST ENVELOPES SECURELY HOLD AND PROTECT SHIPPING DOCUMENTS. THE ENVELOPE FORMS TO SHIPMENT BOXES WHEN PRESSURE IS APPLIED. THESE ENVELOPES ARE PRE-PRINTED ON A DURABLE POLYETHYLENE LAYER WITH A HIGH CONTRAST COLOR GRAPHIC FONT THAT READS ""PACKING LIST ENCLOSED' FOR QUICK CONTENT DESIGNATION. THE ADHESIVE BACKING FEATURES A HOT MELT MATERIAL COMPOSITION FOR STRONG ATTACHMENT TO RIBBED OR CORRUGATED SURFACES. THE CONTENTS ARE ACCESSED BY OPENING ALONG THE SIDE. INSIDE USABLE DIMENSIONS ARE 4""L X 5""W.