Mailing envelope MAILmedia B4 self-adhesive brown 21.3 g – protective postal envelope

MAILmedia B4 self-adhesive brown shipping envelope is a lightweight protective postal envelope designed for sending documents and flat items in B4 format. The envelope has a peel-and-seal closure that enables quick sealing without additional tape. Made for routine business mailings, e-commerce shipments and everyday postal use, it combines low weight with a protective outer layer to limit bending and surface damage during handling and transit.

Advantages

The self-adhesive strip provides fast, secure closure and reduces preparation time for large batches of mail. Its lightweight construction lowers shipping costs while maintaining adequate protection for flat contents. The brown outer surface conceals contents from view and resists scuffs and light moisture. The envelope’s dimensions are suitable for standard B4 documents and single-sheet prints folded or unfolded, simplifying packing for offices and online sellers.

Suitable for

• Sending B4-format documents, brochures and certificates
• Dispatching catalogs, magazines and thin booklets
• E-commerce shipments of flat goods such as posters and canvas prints
• Business mailings and correspondence where low weight and simple sealing are required

Key specifications

• Format compatibility: B4 (suitable for unfolded B4 documents or folded A3/A4 sheets)
• Weight: approximately 21.3 g per envelope
• Closure type: peel-and-seal self-adhesive strip
• Color: brown outer surface
• Material characteristics: lightweight protective paperboard with resistance to surface scuffs

How to use

Place the document or flat item centrally inside the envelope, ensuring edges lie straight and do not force the envelope to bulge. Peel away the protective strip to expose the adhesive and press the flap firmly along the full length to form a complete seal. For added security during transit, press along the flap with a flat tool or the palm of your hand to ensure full contact of the adhesive surfaces.

Usage recommendations

Do not overfill the envelope beyond the recommended flat content for B4 format; excessive thickness can compromise the adhesive seal and protection. Store envelopes in a dry environment away from direct sunlight to preserve the adhesive strip. For valuable or highly fragile items, combine the envelope with additional internal protective layers or choose a rigid mailer designed for heavier or three-dimensional goods.