10"x13" Blue Color Poly Mailers Self Seal Plastic Envelope Bags - 100pcs Blue outer surface/Silver inner lining - Highly opaque for content privacy and professional boutique style appearance Unsurpassed Water & Tear Resistance - 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