Solid Board Cardboard Envelopes & Mailers 278mm x 400mm
£51.48 inc. VAT each
Cardboard Envelopes & Mailers
£0.40 inc. VAT each
Self Seal Envelopes
£11.94 inc. VAT each
Gummed Envelopes
£10.74 inc. VAT each
Folding Inserting Machine Envelopes
£10.74 inc. VAT each
Postal envelopes for letters, documents and mailers
A broad range of postal envelopes and mailers for everyday sending - standard paper postal envelopes in DL, C5 and C4 plus rigid cardboard envelopes for items that must arrive flat. UK-stocked and despatched the same working day before the daily cut-off, with VAT-exclusive pricing that falls as you buy more.
Paper or rigid?
Use a paper postal envelope for letters, statements and light documents, and a rigid cardboard envelope when photos, certificates or prints must not bend. Match the size - DL, C5 or C4 - to your contents to keep postage efficient.
Sizes and postage
DL suits a folded letter, C5 lightly folded A4 or A5, and C4 flat A4. Many stay within the Royal Mail Large Letter profile; for padded protection see padded envelopes & mailers.
Why order postal envelopes from Parcelsend UK
- UK-stocked, same-working-day despatch before the daily cut-off
- DL, C5 and C4 paper plus rigid cardboard options
- Trade pricing that drops as quantity rises (VAT-exclusive)
- Free UK delivery on orders over £100
- Plain stock or branded with custom print
Key takeaways
- Paper and rigid postal envelopes in standard sizes.
- Choose rigid to keep flat goods from bending.
- Related ranges: postage envelopes and business envelopes.
Frequently Asked Questions
What's the difference between a postal envelope and a cardboard envelope?
A paper postal envelope suits letters and light documents; a rigid cardboard envelope is stiff to keep photos, certificates and prints flat. This range includes both so you can match the envelope to the contents.
What size do I need for A4?
Send A4 flat in C4, folded once in C5, and folded into thirds in DL. Product pages list exact internal dimensions.
Do postal envelopes qualify for Large Letter postage?
Many sizes are designed to stay within the Royal Mail Large Letter profile (up to 353 × 250 × 25mm). Check the packed thickness against your postage band before ordering.
Are these envelopes recyclable?
Yes - paper and board envelopes are plastic-free and widely recyclable.
Can I get postal envelopes printed with my brand?
Yes. Upload your artwork online and approve a free sample before production, roughly 72-hour turnaround. See personalised business envelopes.
How quickly do they ship?
All are UK-stocked and despatched the same working day when you order before our daily cut-off.
