Cumberland Booklet Mailer with Window – 90gsm, C5 (162 × 229mm), White, FSC Certified, Box of 500

You need a window mailer that actually survives your laser printer. Most glassine windows soften, warp, or smear at the fuser. Cumberland's booklet mailer uses a heat-resistant glassine window built to handle the print cycle without degrading. FSC certified and responsibly sourced, so it sits comfortably in any sustainability policy you're reporting against. C5 size takes a folded A4 sheet. Box of 500 keeps your monthly mail-out covered without a mid-run reorder

• C5 size (162 × 229mm) – fits A4 folded once
• Heat-resistant glassine window, laser safe
• 90gsm paper, FSC certified
• White finish, booklet mailer style
• Responsibly sourced paper
• Box of 500 for consistent volume