This larger kraft bubble mailer size is designed for goods sitting just above B5 but still in or around the A4 size range. The outer kraft paper is strong, tear-resistant by hand and rustic in appearance; the inner HDPE bubble lining protects the contents from shocks and vibrations. This 30-piece pack is ideal for webshops and small publishers shipping medium-large, flat products.
What is included in the 30-piece pack
The pack contains 30 kraft bubble mailers, each with an outer dimension of 235×275 mm and an additional 40 mm closure flap. The total weight is approximately 1.25 kg, and a single mailer weighs around 38 grams. The mailers arrive in a flat bundle, in a form well suited to space-saving storage.
Material and bubble lining
The outer kraft paper is durable, tear-resistant by hand, with a classic brown tone. It is specifically resistant to creasing, tearing and minor abrasion during postal transit — even when the parcel passes through multiple handlers. Inside, an HDPE-based bubble lining protects the contents with evenly distributed air cells. The kraft exterior and HDPE interior combine for reliable two-layer protection.
Size and use
The 235×275 mm outer dimension accommodates B5 (176×250 mm) and small-A4 (approaching around 210×297 mm) formats. It fits a thicker hardcover book, a photo album, a calendar, a folder-style document bundle, a larger clothing item (such as trousers, a shirt collar, a gathered clothing set) and 1-2 medium textile samples at once. For webshops shipping books, clothing or documents alike, this is a daily-use size in the upper range.
Closure and opening
The +40 mm flap has a self-adhesive strip on its inner side. After removing the protective tape, the flap closes in a single motion and provides a durable, tamper-evident seal. The recipient opens the envelope along the flap with a tearing motion. The seal is single-use: once opened, it no longer offers adequate postal security.
Storage and durability
Store the mailers as a flat bundle in a dry, cool location, away from direct sunlight. Humid environments, prolonged sun exposure or high temperatures gradually weaken the adhesive strip. With proper storage the 30-piece bundle retains its quality for many months.