Pre-labeled envelope features a waterproof, oil-proof and moisture-resistant design to ensure your package is secure. Front reads: “Important: Invoice and/or Packing List Enclosed.” Self-adhesive offers a quick and easy way to seal your package. Top layer is made of an LDPE 45 micron adhesive and an LDPE 30 micron adhesive bottom layer. Self-adhesive measures 25 gsm hot melt, and the release paper measures 70 gsm. COLOR: White UPC: 035255419284 UPC: 035255419284. No returns.