I run a small e-commerce business here in Houston, and shipping supplies are one of those expenses that either eats into your margins or keeps operations running smooth. When I ordered the Metronic Poly Mailers 12×15.5 Envelope Mailers 200pack Shipping Bags with Self Adhesive Waterproof and Tear-Proof Postal Bags in White, I was looking for something that wouldn’t let me down. After years in the Marine Corps, I learned that reliability matters more than anything else, and I apply that same standard to the products I use in my business. At $53.