These mailers are made from plastic/polypropylene (poly) and include internal bubble cushioning. One listing specifies 3/16" bubble cushioning as the internal wrap.
Most of the listed mailers use a self-adhesive (peel-and-seal) closure. Descriptions mention peel-and-seal strips or a self-sealing adhesive for quick packing.
They are described as water-resistant or moisture-resistant in the listings, protecting contents from rain, humidity, spills, leaks, snow and dirt.
Pack quantities vary by listing. Examples from the descriptions include packs of 1, 4, 10, 25, and 500 units.
Some listings provide both outside and usable (interior) sizes; the usable size is the interior space available for contents and is typically slightly smaller than the outside dimensions. Examples shown include an outside size of 4 x 8 inches with a usable size of 4 x 7 inches, and an outside size of 9.5 x 14.5 inches with a usable size of 9.5 x 13.5 inches. Check each product listing for exact usable dimensions.
Some listings note the mailers are made with 50% recycled content and state that the mailers are store drop-off recyclable.