About this item 100 UNPADDED 10x13 INCH POLY MAILERS: Pack contains 100 poly mailers in 10x13" size. These envelopes are UNPADDED and can be used for shipping non-fragile items. SHIP IN STYLE: Our top quality mailing bags in a large selection of designer prints will help you to distinguish your brand by personalizing the experience for the customer, creating a remarkable and memorable moment upon receipt. CONFIDENTIAL, DURABLE AND SECURE: Our mailers are 3.15mil thick, 57.5% thicker than the standard 2mil. This makes them durable, opaque, and weather resistant. Extra secure adhesive creates a strong, tamper-evident seal that ensures shipments will not open. NOTE REGARDING SIZE MEASUREMENTS: The thickness of your product determines the size you require. To determine width: Add the Width of product + Thickness of product + ½ inch. To determine length: Add the Length of product + Thickness of product + 1 inch. VIEW OUR ENTIRE RANGE: You can view our entire range of prints and sizes at the Inspired Mailers Amazon Store by clicking on "Visit the Inspired Mailers Store" at the top of this listing.