This 25-piece pack contains kraft bubble mailers with a 245×350 mm outer size and a 40 mm sealing flap. The outer layer is robust kraft paper while the inner layer is an HDPE-based bubble film that cushions impacts during transit. It has been put together for webshop owners, craftspeople and small businesses who want to ship larger, flatter items reliably yet economically.
What is included in the 25-piece pack
The pack contains 25 kraft bubble mailers, each in 245×350 mm outer size with a 40 mm sealing flap at the top edge. The total gross weight is approximately 1.38 kg, so even in this larger quantity it is easy to store on a shelf or in a stock drawer. The pack size covers the needs of a mid-volume webshop for several weeks and also serves as an ideal buffer stock for craft markets and fairs.
Material and bubble lining
The outside of the envelope is made of kraft paper whose natural brown tone gives a clean, considered look to the parcel. The inside is an HDPE-based bubble film that forms a layer of small air pockets between the contents and the outside world. This combination provides a paper-like, pleasant surface for the recipient while delivering serious mechanical protection during shipping — it copes particularly well with pressure and knocks.
Size and use cases
The 245×350 mm outer size typically accommodates an A4 document set, a mid-sized book, smaller notebooks, a flat fabric sample, or several smaller items packed together. The 40 mm flap means you do not have to fill the envelope tightly to the edge — there is room for a clean closure, and the contents are not pressed against the adhesive strip.
Closure and opening
The inside of the flap carries a self-adhesive strip that can be sealed in a single motion once the protective tape is removed. The mailer is therefore given a secure, tamper-evident closure: the recipient has to tear the flap to access the contents, which means any reopening is visible. This signals to the receiver that the parcel arrived in its original state.
Storage and shelf life
Store the envelopes in a dry, cool place, away from direct sunlight, either flat or in light stacks. The protective tape on the adhesive strip ideally retains its full tack for 12 to 18 months from production — it is worth rotating your stock continuously. Moisture may soften the kraft layer, so storing directly on the floor is not recommended.