Envelope C5 NC Koperty white 90 g/m² 162×229 mm blue inner print pack 25 pcs

NC Koperty Envelope C5 white 90 g/m² with blue inner print, size 162×229 mm, is designed for mailing folded A4 documents or flat A5 materials. The envelopes are made from 90 g/m² white paper, offering a balance of opacity and durability for everyday office and postal use. Supplied in a pack of 25 pieces, these C5 envelopes are suitable for standard correspondence, invoices, letters and promotional inserts where a discreet inner design and reliable closure are required.

Advantages

The 90 g/m² paper provides increased stiffness and opacity compared with lighter alternatives, helping to protect contents and reduce show-through. The blue inner print conceals the contents, adding privacy without affecting external presentation. Standard C5 dimensions (162×229 mm) fit commonly folded A4 documents and flat A5 items, while the white exterior maintains a professional appearance. The 25-piece pack size is practical for small offices, reception desks or periodic mailings.

Suitable for

• Mailing folded A4 documents such as contracts, invoices and letters
• Enclosing A5 brochures, flyers and promotional inserts
• Everyday office correspondence and postal mailings
• Storage and internal document transfers where opacity is important

Key specifications

• Format: C5 (162×229 mm)
• Material weight: 90 g/m² white paper
• Inner design: blue printed interior for added opacity and privacy
• Pack quantity: 25 envelopes per pack
• Closure type: standard gummed or self-adhesive flap (check product variant)

How to use

Insert folded A4 or flat A5 documents into the envelope so that edges align with the flap for a secure fit. Moisten the gummed flap or remove the protective strip on a self-adhesive variant, then press firmly to seal. Address the envelope on the front exterior; use a printed label or write directly on the surface with pen or marker suitable for paper. For mailing, ensure the weight and postage meet local postal service requirements.

Usage recommendations

Store envelopes flat in a dry environment to prevent curling or moisture damage. For important or confidential documents, combine the blue inner print with an additional inner sleeve or use registered mail options. Avoid overfilling to maintain flap adhesion and prevent tearing during transit.