Package includes 1000 pcs adhesive packing list envelopes. Size: 4.5"x5.5", inside size: 4"x5".Packing slip envelope pouches are made of premium material LDPE, durable, not easy to tear and break.Waterproof and dirty free, shipping label sleeves are suitable for mailing packing slips, packing lists, invoices, shipping labels.Features self-adhesive design, you can stick the envelope securely on your packages. Clear outer surface makes it easy for barcodes to be scanned.Protect all paperwork from bad weather and handling conditions. Ideal for courier companies, small business, retails, EC, daily use and industrial use.