Flip-N-Seal envelopes (also sold as Flip-Stik-Seal) feature a double-flap design with a pressure-sensitive adhesive that requires no moisture. The envelope ships open for easy machine-inserting; to seal, simply flip the inner adhesive flap over the stuffed envelope and press. They’re the professional standard for computer-generated invoices, bank statements, and payroll inserts. The interactive guide below shows the flip-and-seal mechanism step by step.
How Flip-N-Seal (Flip-Stik-Seal) Envelopes Work
- No moisture required: Pressure-sensitive adhesive seals on contact — no licking or water needed.
- Ships open: Designed for machine inserters — runs flat through folding/inserting equipment.
- Secure closure: Once pressed, the flap creates a tamper-resistant seal.
- Best for: Invoices, bank statements, payroll envelopes, direct mail.
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