Works with first class mail too. White Owl Design outer surface with pale grey Chevron Background/Grey inner lining - Owl print across both the front and back of each bag 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 - 100% recyclable