The listings consistently identify the poly mailers as made from polyethylene.
Padded mailers include an inner layer of bubble cushioning for extra protection. They’re also described as moisture-resistant and tamper-evident, helping protect semi-fragile items during transit.
Yes—some listings provide both inside and outside measurements. For example, a #6 mailer is shown with inside dimensions of 14.5 × 19 in and exterior dimensions of 14.5 × 20.5 in.
Several descriptions call the mailers waterproof or moisture-resistant and puncture- or tear-resistant. Thicker constructions (notably 3 Mil) are specifically noted as better at resisting punctures and tears.
Pack counts shown in the results include 3, 100, 250, and 500 per pack.
Expandable (gusseted) mailers have a bottom gusset for extra internal space—listed as roughly 20–40% more capacity. Descriptions also note they can be made 3 Mil thick for added puncture/tear protection and commonly list water resistance and a self-sealing closure.
Self-sealing strips let you close mailers quickly without additional tape, speeding packing. Listings commonly call the closure a peel-off or peel‑n‑seal strip, and some descriptions note the seal is tamper-evident.
