Mailing bags MAILmedia PR390618 B4 size, grey, pack of 250

MAILmedia PR390618 B4 size mailing bags in grey, supplied as a pack of 250, are lightweight protective envelopes designed for sending documents and other flat items. The bags are sized to accommodate B4-format materials and include tamper-evident closure to help protect contents during transit. These mailing bags are intended for high-volume use where economical, consistent protection and simple handling are required.

Advantages

These grey B4 mailing bags offer a balance of low weight and protective function, reducing postage costs while providing a tamper-evident closure that signals unwanted access. Packaged in a bulk set of 250, they support efficient storage and logistics for offices and e-commerce operations. The neutral grey exterior conceals contents from view and provides a uniform outward appearance for professional mailings.

Suitable for

• Sending B4 documents, brochures and flat printed materials
• Bulk mailings from offices, institutions or organizations
• E-commerce shipments of flat items such as small catalogs or paperwork
• Archiving or internal transfer of documents where tamper-evidence is required

Key specifications

• Format: B4-compatible internal dimensions suitable for B4 documents
• Color: grey exterior
• Pack size: 250 units per pack
• Closure type: tamper-evident adhesive flap
• Material: lightweight protective envelope material designed for mailing
• Intended use: single-use postal mailing and document protection

How to use

Insert the document or flat item into the bag ensuring it lies flat and does not overfill the envelope. Peel off the protective strip from the adhesive flap and press firmly along the flap edge to seal. For heavier or bulkier content within the B4 format, ensure the item does not stretch or distort the bag to maintain tamper-evident effectiveness. Label or print the recipient address directly on the bag or affix a shipping label in a visible location.

Recommendations

Store unopened packs in a dry, cool environment away from direct sunlight to preserve adhesive performance. When preparing large mailing batches, test one sealed bag to confirm adhesive bonding and correct fit before sealing entire batches.