The Packing list envelope in clear color measuring 4.5" x 7.5" is made of 2 mil tamper proof material to keep documents clean and safe. Envelope has back loading design and helps you keep things organized, sold as 1000 per case..Transparent pressure sensitive envelopes allow your document to be read.2 mil tamper proof envelopes keep documents clean and safe.Hot melt adhesive backing provides strong adhesion to paper and corrugated products.Packing List Envelope is transparent pressure sensitive envelope that allows your document to be read..Clear Face Document Envelopes 4.5" x 7.5" with see through front panel allows easy reading of the contents. Peel and stick backing for easy application. 2 mil poly construction keeps contents dry, clean and safe. First measurement is the opening side.