Outside dimensions are 4 x 8 inches; the usable/inside space is about 4 x 7 inches.
Most use a self-adhesive peel-and-seal (self-seal) closure that creates a tamper-evident seal once closed.
Poly-style mailers typically list a bubble thickness of about 3/16 inch; kraft-lined options are listed with about 2/16 inch (roughly 1/8 inch) bubble lining.
Common pack sizes shown include 10, 25, 50, 100, and 500-count options.
They’re listed as suitable for mailing papers, documents, letters, photographs, paintings, and small items such as jewelry, stones, coins, and buttons.
Poly options are described as water-resistant and tear- or puncture-resistant, protecting against water, snow, and dirt; some listings also label them tamper-resistant.
Kraft (paper-covered) mailers are noted to have an extra-smooth paper surface that’s easy to write on and to accept labels and stamps.
