Postal Envelopes
Cardboard and board envelopes, plain & window self-seal options — sized for secure, professional mailings.
Cardboard Envelopes
Rigid mailers that protect photos, documents and prints.
Cardboard Pocket Envelopes
Short-edge opening for easy insertion and firm seal.
All Board Envelopes
Premium board both sides for maximum rigidity.
Plain Self Seal Envelopes
Peel, press and post—clean look, reliable seal.
Window Self Seal Envelopes
Pre-aligned window for address clarity and speed.
Our Eco Promise
Recyclable, biodegradable & FSC® options across the range.
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Delivery Information
12pm cut-off for next-day. Free delivery over £150 ex VAT.
Order in Minutes — Delivered Next Day
1) Browse & Compare
Find the right box, tape or protection with clear specs and sizing.
2) Add to Cart
Bulk discounts apply automatically. Free delivery over £150 ex VAT.
3) Fast Delivery
12pm cut-off for next-day delivery from UK-held stock.
Postal Envelopes – Cardboard, Pocket & Self-Seal
Explore Pack Exact’s range of postal envelopes designed for fast despatch and letterbox-friendly delivery. From rigid cardboard envelopes and cardboard pocket envelopes to all board envelopes, plus plain self-seal and window self-seal envelopes—everything you need for secure document and small-item mailing.
Cardboard Enveloples
Rigid paperboard mailers that protect flat items from bends and corner knocks. Ideal for prints, photos, certificates and slim books.
Cardboard Pocket Envelopes
Open-end loading with stiff sides for quicker packing of documents, brochures and catalogues while keeping edges pristine.
All Board Envelopes
Heavy-duty board on all faces for maximum rigidity—our go-to for premium prints, artwork and photo sets in transit.
Plain Self-Seal Envelopes
Office-friendly peel-and-seal envelopes for invoices, letters and despatch paperwork. Clean look, fast closure.
Window Self-Seal Envelopes
Address-window formats to align with printed letters—no extra label needed, speeding up mail runs and reducing errors.
Compare postal envelope options
| Type | Best for | Protection | Closure | Notes |
|---|---|---|---|---|
| Cardboard Enveloples | Certificates, photos, prints | High (rigid front/back) | Peel & seal | “Do Not Bend” performance; recyclable |
| Cardboard Pocket Envelopes | Brochures, documents, catalogues | High (stiff sides) | Peel & seal | Open-end loading for faster bench work |
| All Board Envelopes | Artwork, premium prints | Very high (board all faces) | Peel & seal | Maximum bend resistance; premium finish |
| Plain Self-Seal | Letters, invoices | Low–Medium | Self-seal | Cost-effective office staple |
| Window Self-Seal | Automated mail runs | Low–Medium | Self-seal | Align address in window; no label required |
Cardboard & All Board – when rigidity matters
Choose cardboard envelopes or all board envelopes when bends and corner scuffs are the main risk. They deliver a premium, document-safe appearance and are fully recyclable. For extra surface protection, add tissue paper or cardboard sheets as interleaves.
Shipping small 3D items instead? Consider postal boxes or book wraps for added depth and edge strength.
Self-Seal Envelopes – speed for letters & paperwork
Plain self-seal and window self-seal formats streamline despatch and office mail. Peel-and-seal closures provide a clean, secure finish; window options reduce label printing and error risk by revealing the printed address line.
Pair with address/handling labels and attach despatch paperwork using documents enclosed wallets for a tidy, scannable parcel exterior.
Packing tips for better delivery rates
- Right thickness: stay within carrier letterbox limits to reduce postage. Use rigid board for bend-sensitive items.
- Surface protection: add tissue or glassine for prints and photos.
- Neat sealing: press peel-and-seal firmly across the full flap to prevent snagging in conveyor systems.
- Clear addressing: use high-contrast labels or window alignment; keep barcodes flat and unobstructed.
Postal Envelopes – Frequently Asked Questions
Both are rigid, but all board envelopes use heavy board on all faces for maximum bend resistance—ideal for premium prints and artwork.
Use pocket envelopes for open-end loading of documents and brochures—faster bench packing with stiff sides for protection.
Yes—our cardboard and all-board formats are widely recyclable. Remove non-paper elements if required locally.
Choose window for automated mail runs (no extra label), and plain for general letters, invoices and branded inserts.
Switch to a shallow postal box or a book wrap to maintain letterbox-friendly dimensions while adding depth and edge protection.