Envelope C4 NC Koperty model NCKO0057 — size C4, pack format unspecified

NC Koperty C4 envelope (model NCKO0057) is a standard C4-size mailing envelope designed to hold unfolded A4 sheets and other documents without folding. It is produced for everyday postal shipments, office correspondence and secure document transport where C4 format is required. The envelope offers compatibility with common office printers and mailing workflows while providing a simple, functional option for document handling.

Advantages

The envelope provides a consistent C4 size that accommodates A4 documents flat, reducing the need for folding and preserving document condition. Its construction is aimed at standard postal handling and filing; the design supports easy insertion and removal of papers and fits common filing systems. The neutral appearance and standard dimensions make it suitable for diverse business and administrative uses.

Suitable for

• Posting unfolded A4 letters and documents
• Office correspondence and invoicing
• Document storage and archiving
• Presenting certificates, reports or proposals without folding

Key specifications

• Format: C4, sized to fit unfolded A4 sheets
• Intended use: mailing, document storage, office correspondence
• Material: paper envelope (standard mailing weight)
• Closure type: standard envelope flap (manual sealing)
• Color: neutral (typical mailing envelope tone)

How to use

Insert unfolded A4 documents into the envelope with the flap side up to ensure a secure fit. Seal the flap according to the envelope's closure method—moisten and press if gummed, or use an adhesive tape or label if additional security is required. Address and postage can be applied directly to the front surface. For machine processing, ensure contents are flat and positioned centrally to avoid jamming.

Usage recommendations

When sending important or sensitive documents, supplement the envelope with a protective inner sleeve or use additional sealing methods to prevent moisture ingress and unintended opening during transit. For bulk mailing, test compatibility with your postal or inserting equipment to confirm reliable feed and sealing.