Cumberland Self-Seal Secretive Envelope – 11B, 90 x 145mm, 80gsm White with Security Pattern & Window Face, Box of 500

You're sending something that shouldn't be read over someone's shoulder in the mailroom. The Cumberland secretive envelope handles that.

The security pattern on the face deters casual peering, and the window face lets you address it cleanly without an extra label. Self-seal closure means one press and it's done — no glue, no fumbling.

80gsm white paper at 90 x 145mm (11B) fits standard A4 documents folded to size. The weight keeps contents from showing through while staying postage-friendly.

A box of 500 covers your confidential mailing run without a mid-week resupply dash.

Add to cart and get those sensitive letters out the door

• Security (secretive) pattern on face deters casual peering at contents
• Window face for clean addressing without extra labels or handwriting
• Self-seal closure — press to seal, no adhesive or moisture needed
• 80gsm white paper prevents show-through while staying lightweight
• 11B size (90 x 145mm) fits standard A4 documents folded to size
• Box of 500 for sustained confidential mailing runs