Herlitz C4 Mailing Envelopes 229 × 324 mm with Window, Peel and Seal, 90 g/m² Paper, Pack of 25, White

The Herlitz 10837557 is a pack of 25 white C4 mailing envelopes (229 × 324 mm) with an address window and peel-and-seal closure, made from 90 g/m² paper — for posting A4 documents flat, without folding, with the address printed on the letter itself.

Peel and seal means no moistening: remove the protective strip and press the flap down. The window lets the recipient address on your A4 letterhead or invoice show through, so you do not need to print or write a separate label.

• 25 Herlitz C4 mailing envelopes with window, white
• Shrink-wrapped pack

• C4 takes an A4 sheet unfolded — contracts, certificates and brochures arrive without creases.
• The window works with standard A4 letters and invoices where the address block is positioned for windowed envelopes; check your letterhead layout once before a large mailing.
• Peel and seal closes instantly and cleanly, which matters when you are closing dozens of envelopes for a mailing.
• 90 g/m² paper gives a more solid envelope than lightweight 80 g/m² office envelopes.

• Without folding, A4 does not fit smaller formats — but folded A4 letters belong in C5 or DL envelopes, not here; C4 is oversized for them.
• Thick catalogues or binders will not fit: this is a flat envelope without gusset.
• The window position and size are not published by Herlitz — if your software prints addresses in a non-standard position, test one letter first.
• It is not a padded or bubble envelope and gives no impact protection.