cardboard mailer

Common closure types include traditional tuck or flap closures, tab‑locking designs, options sold with no built‑in closure (which require tape), self‑adhesive (peel‑and‑seal) strips, and tear‑away quick‑open strips on rigid envelopes.

Many boxes advertise tool‑free or easy assembly using precision cut slots and tab‑locking designs so no extra materials are needed. Some listings also arrive 'ready to ship' with printed sender/recipient label areas.

These mailers are used for a wide range of items, including books, electronics, documents, shoes and sneakers, clothing, photos and picture frames, crafts, cosmetics, tumblers, and small valuables or cash (in tear‑strip envelopes).

Most boxes use corrugated paper/cardboard (including multi‑layer and E‑flute constructions). Rigid mailer envelopes are made from heavier cardstock—for example, some yellow tear‑strip envelopes use 350gsm board.

The rigid tear‑strip envelopes are about 9.45 × 4.1 inches, made from durable 350gsm yellow cardstock, include a secure self‑adhesive (peel‑and‑seal) strip plus a tear‑away quick‑open strip, and are sold in packs of 48.