Confidential and secure content: large opaque brown envelopes, waterproof and 100% moisture resistant that guarantee the contents and confidentiality of your package. Variety of uses: paper envelopes for general use. They can be used for private use, in stores, post offices, gift shops. Ideal for notebook holders, sheets, invitations, etc.Easy adhesive closure: kraft paper bags are self-sealing for easy packaging with a secure tamper-proof closure. Wet glue. Eco-friendly material: recycled paper bags for environmentally friendly shipping. Natural paper has a pleasantly rough surface without reflections, glitters or layers.