Business Mail & Envelopes UK

Office & Mailing Envelopes

Plain, window, recycled, protective and specialist envelopes for everyday business mail.

From invoices and routine correspondence to contracts, certificates and protected postal items, find envelopes around what you are sending. Choose DL, C5 and C4 formats alongside padded, board backed, internal, security and machine-compatible mailing options.

Shop Envelopes Greener Choices All 9 Categories ↓

Protective Business Mail

Protective Mailing Envelopes Added protection for documents and smaller postal items →

Quick Access

Plain Envelopes Window Envelopes Padded Mailers View All 9 Categories ↓

Match the Envelope to the Contents

Start with what you are sending

Everyday letters and invoices generally need a very different envelope from a certificate, catalogue or small product. Choosing around document size and the protection actually required helps avoid unnecessary packaging while keeping contents appropriately protected.

Also consider closure type, whether an address window is useful, the volume being mailed and whether contents need to remain flat, cushioned or tamper evident.

Quick Buying Guide

Which envelope?

Letters & invoices
Plain or window envelopes

Must remain flat
Board backed envelopes

Needs cushioning
Padded envelopes

Sensitive contents
Security envelopes

Everyday & Specialist Envelopes

Shop envelopes by mailing requirement

Eight quick routes cover most business mailing requirements, with all nine native envelope categories available further down the page.

Everyday Mail Plain Envelopes White and manilla envelopes for letters and general correspondence → Business Post Window Envelopes Address-window envelopes for invoices, statements and letters → Protective Mailing Padded Bags & Envelopes Added cushioning for products, documents and delicate contents → Keep Flat Board Backed Envelopes Rigid-backed mailing for documents that should not bend → Reuse Internal Envelopes Reusable formats for documents moving around an organisation → Higher Volumes Machine Envelopes Formats for compatible inserting and mailing equipment → Sensitive Mail High Security Envelopes Secure and tamper-evident formats for sensitive contents → Mailing Bags Polythene Envelopes Lightweight mailing bags for suitable non-rigid contents →

Skip to All 9 Envelope Categories ↓

From Routine Mail to Extra Protection

Different contents need different protection

Choose the simplest format that will do the job properly, then add protection where the contents genuinely require it.

Cushion Padded Mailing Envelopes Added protection for contents that need cushioning in transit →

Addressed Mail Window Envelopes Display recipient details directly from the enclosed document →

Paper Protection Paper Padded Mailers Paper-based protective mailing for suitable smaller items →

Keep Flat Board Backed Envelopes Rigid protection for documents, photographs and certificates →

Envelope Size Guide

DL, C5 or C4?

Start with the document size and whether it can be folded. Then choose the closure and protection level around the mailing task.

DL Everyday Business Letters Common for A4 correspondence folded into thirds.

C5 A5 & Folded A4 Useful for A5 documents or A4 sheets folded once.

C4 Unfolded A4 Documents A practical choice where A4 paperwork needs to stay flat.

Closures Self-Seal & Peel & Seal Convenient closure formats for routine mailing.

Greener Mailing Choices

Reduce unnecessary packaging without under-protecting the contents

Start by choosing an envelope that closely matches the contents. A standard letter rarely needs padded packaging, while fragile items or important documents may justify additional protection if it prevents damage and repeat sending.

Where product information supports it, compare recycled content, responsible fibre sourcing and end-of-life options alongside everyday performance.

Recycled Envelope Guide Browse Everyday Envelopes

Paper-Based Padded Mailers Protective mailing with paper-based options available

Reuse Before Replacing

Internal mail is one of the simplest places to reuse

When paperwork only needs to move between people, departments or sites within the same organisation, reusable internal envelopes can often perform multiple journeys before replacement.

Shop Internal Envelopes

Useful Guides & Related Ranges

Improve the wider mailing and purchasing setup

Regular Business Mailings?

Standardise frequently used envelope sizes and formats

Businesses sending regular mail can reduce unnecessary duplication by standardising the main envelope sizes and formats used across teams. A Green Office business account can also make repeat ordering and frequently purchased stationery easier to manage.

Business Account Benefits Discuss Your Requirements

The Right Envelope for the Job