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Self Seal
Press to close - no strip, no moisture. Self-seal envelopes and mailers use a pre-applied pressure-sensitive adhesive that bonds on contact when the flap is pressed down. Faster than gummed, simpler than peel and seal, and available across business envelopes, coloured formats and mailing bags.
Browse related: Peel and Seal | Self Seal Business Envelopes | Business Envelopes
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More About "Self Seal"
Self Seal feature a self-seal closure, pressure-sensitive self-adhesive closure requiring no moisture or liner removal. The range covers over 5 products across over 15 sizes and 2 colours, at 75–100gsm paper weights.
Benefits of Self Seal
- Self-Seal closure — pressure-sensitive self-adhesive closure requiring no moisture or liner removal.
- Multiple sizes — including C5 - 229 x 162mm, C4 - 229 x 324mm.
- Colour range — 2 colours across the range.
- Paper weight choice — 75–100gsm.
- Royal Mail compatible — qualifies as large letter or letter within standard weight limits.
Frequently Asked Questions
When should I choose self-seal envelopes?
Self-Seal envelopes are the preferred choice for office dispatch, business mailings and any application where speed of closure is important. The self-seal closure pressure-sensitive self-adhesive closure requiring no moisture or liner removal.
What sizes are available?
Available in over 15 sizes: 60 x 60mm, 67 x 98mm, 89 x 124mm, 102 x 108mm, 102 x 152mm, 102 x 216mm. Standard formats include DL, C6, C5 and C4 for correspondence and documents, plus square formats for greeting cards.
Do these come in colours?
Yes — 2 colours are available across the range. Coloured envelopes with a self-seal seal are particularly popular for greeting cards and invitation campaigns.
What Our Customers Say
See why we’re trusted as by thousands of UK businesses for packaging and envelopes through our customer reviews.
Envelope Printing Customer
We needed branded envelopes for a client event and they looked exactly right. The team were helpful from start to finish and made sure everything moved quickly so we could meet our deadline. A really smooth experience for printed envelopes.
Envelope Customer
My order arrived with a problem, but after I emailed the team I received a quick response and the issue was sorted straight away. It was handled professionally and made me feel confident about ordering again.
First Time Customer
There was an issue with the courier delivering to my address, but the team dealt with it quickly and kept things moving. A replacement was arranged and the previous order was refunded without any fuss. It gave me a good first impression and I would order again.
Wholesale+ Member
The courier caused a problem, but Jess and Kelly were quick to help and did everything they could to sort it. They also looked at the products I order regularly and helped make future orders easier. Good value, good quality and service that feels genuinely useful.
Envelope Printing Customer
Ordering custom printed envelopes was straightforward from the start. James answered my questions clearly, the order arrived when expected and the finished envelopes were great quality. I would be happy to use the service again.
Wholesale+ Member
A very straightforward company to buy from. The team were helpful, clear with communication and easy to deal with, which makes a big difference when ordering packaging regularly.
Sample Customer
The team helped point me towards the right product before I placed my order. It made the decision much easier and gave me confidence that I was choosing the right packaging for what I needed.
Packaging Customer
Useful support for flat pack cartons

