Envelope pack NC Koperty KOPERTY B4 SK self-adhesive brown 50 pcs

Self-adhesive B4 envelopes from NC Koperty, model KOPERTY B4 SK, supplied in a pack of 50 brown kraft envelopes. These envelopes are sized for B4 documents and printed materials and feature a pressure-sensitive adhesive strip for quick closure without dampening. Constructed from durable kraft paper, they are intended for mailing, filing and internal document transfer where a larger envelope and robust construction are required.

Advantages

The self-seal strip enables fast, reliable closure without the need for water or additional adhesive, reducing handling time. Kraft paper construction provides tear resistance and structural stability for heavier documents and multiple-sheet contents. The natural brown finish hides minor dirt and fingerprints and presents a neutral, professional appearance suitable for many office and shipping contexts.

Suitable for

• Mailing and courier shipments of documents and printed materials in B4 format
• Archival storage and internal filing of larger documents
• Retailers and offices preparing invoices, catalogs or samples
• Enclosing manuals, brochures or multiple-page contracts

Key specifications

• Format: B4 compatible dimensions for A4 folded or B4-sized sheets
• Quantity: 50 envelopes per pack
• Closure: pressure-sensitive self-adhesive strip (peel-off cover)
• Material: brown kraft paper with reinforced flap for secure sealing
• Finish: natural kraft surface that resists fingerprints and light abrasion

How to use

Insert the documents so they lie flat inside the envelope, remove the protective strip covering the adhesive and press the flap firmly along the closure edge to secure. For heavier contents, press along the full length of the seal to ensure an even bond. Store unopened packs in a dry place at room temperature to preserve adhesive performance and paper quality.

Usage recommendations

For postal or courier use, confirm that the envelope size and weight meet carrier requirements; reinforce with tape if shipping heavy or bulky contents. Avoid exposing sealed envelopes to prolonged humidity or high temperatures to maintain adhesive effectiveness and paper integrity.