100% Non-See Through, The Interior of our Multi-Layer Bags are Made with a Dark Lining Preventing the Contents of the Bag from Being Seen During Shipping. Lips 👄 Kiss Poly Mailers 10x13 Pack of 25 Unsurpassed Water & Tear Resistance. USPS APPROVED FEDEX APPROVED UPS APPROVED Superior side seams combined with Heavy Duty polyethylene make these High Quality envelopes highly resistant to water, punctures, and tears. Pressure sensitive self seal. Easy packing, tamper-evident, and super secure closure. Light Weight & Time Saving! Lower shipping costs combined with faster shipment preparation equal big savings over other packaging option. 100% recyclable!