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Collection: Large Letter Size Envelopes

The envelope format that unlocks large letter postage rates. Large letter size envelopes are sized to fit within Royal Mail's large letter specification (up to 353 x 250mm, max 25mm depth) - allowing you to send thicker documents, multiple sheets and small flat items at the large letter rate rather than the higher small parcel rate.

Browse related: Large Letter Postal Boxes | Standard Letter Size | Letterbox Friendly Envelopes

177 products

Tyvek Envelopes - No 330 x 250mm

Tyvek Envelopes

Regular price From £1.19
Sale price Regular price
Vinyl Record Mailer 7' & 12' -

Vinyl Record Mailer 7' & 12'

Regular price From £1.27
Sale price Regular price
White Adhesive Labels - 64 x 38mm
Eco Product

White Adhesive Labels

Regular price From £0.23
Sale price Regular price
Load video: White White All Board Envelopes

White All Board Envelopes

Regular price From £0.21
Sale price Regular price
White Blue Opaque Gummed Business Envelopes - 100gsm With Window DL - 110 x 220mm

White Blue Opaque Gummed Business Envelopes

Regular price
Sale price From £0.07 Regular price £0.12
White Blue Opaque Peel and Seal Business Envelopes - No Without Window

White Blue Opaque Peel and Seal Business Envelopes

Regular price
Sale price From £0.08 Regular price £0.40
White Blue Opaque Self Seal Business Envelopes - Without Window Wallet C5 - 162 x 229mm

White Blue Opaque Self Seal Business Envelopes

Regular price
Sale price From £0.07 Regular price £0.08
White Board Back Envelopes - Yes With Window C4 - 324 x 229mm
Eco Product

White Board Back Envelopes

Regular price From £0.14
Sale price Regular price
White Board Back Envelopes (White Board) - C4 - 324 x 229mm

White Board Back Envelopes (White Board)

Regular price From £0.23
Sale price Regular price
White ColomPac Book Wrap Mailer - 250 x 190mm

White ColomPac Book Wrap Mailer

Regular price From £1.44
Sale price Regular price
White Coloured Gummed Envelopes - Square - 40 x 40mm

White Coloured Gummed Envelopes

Regular price From £0.07
Sale price Regular price
White Coloured Peel and Seal Envelopes - Without Window 120gsm
Eco Product

White Coloured Peel and Seal Envelopes

Regular price From £0.10
Sale price Regular price
White Coloured V Flap Envelopes - Gummed 120gsm
Eco Product

White Coloured V Flap Envelopes

Regular price From £0.07
Sale price Regular price £0.07
White Corrugated Paper Bubble Bag Mailers - 340 x 240mm

White Corrugated Paper Bubble Bag Mailers

Regular price From £0.19
Sale price Regular price
White Eco Friendly Bubble Bag Mailers - 165 x 100mm
Eco Product

White Eco Friendly Bubble Bag Mailers

Regular price
Sale price From £0.30 Regular price £0.43
White Gloss Finish Bubble Bag Mailers - 165 x 165mm

White Gloss Finish Bubble Bag Mailers

Regular price From £0.55
Sale price Regular price
White Kraft 90gsm Padded Mailer - 215 x 120mm
Eco Product

White Kraft 90gsm Padded Mailer

Regular price From £0.20
Sale price Regular price
White Non Opaque Peel and Seal Business Envelopes - 98 x 67mm

White Non Opaque Peel and Seal Business Envelopes

Regular price
Sale price From £0.10 Regular price £0.12
White Organza Bag - 300 x 200mm

White Organza Bag

Regular price
Sale price From £0.14 Regular price £0.16
White Paper Finish Bubble Bag Mailers - 165 x 100mm
Eco Product

White Paper Finish Bubble Bag Mailers

Regular price From £0.14
Sale price Regular price
White Pearlescent Envelopes - Peel and Seal DL - 110 x 220mm
Eco Product

White Pearlescent Envelopes

Regular price From £0.11
Sale price Regular price
White Pillow Boxes - DL - 110 x 220mm
Eco Product

White Pillow Boxes

Regular price From £0.39
Sale price Regular price
White Premium Business Envelopes - Without Window N A C4 - 324 x 229mm

White Premium Business Envelopes

Regular price
Sale price From £0.10 Regular price £0.12
White Premium Gusset Peel and Seal 180gsm Envelopes - C4 - 324 x 229 x 25mm
Eco Product

White Premium Gusset Peel and Seal 180gsm Envelopes

Regular price From £0.48
Sale price Regular price
White Premium Peel and Seal 160gsm Envelopes - C5 - 229 x 162mm

White Premium Peel and Seal 160gsm Envelopes

Regular price From £0.52
Sale price Regular price
White Premium Peel and Seal 180gsm Envelopes - Wallet 114 x 229mm
Eco Product

White Premium Peel and Seal 180gsm Envelopes

Regular price
Sale price From £0.20 Regular price £0.43
White Premium Window Peel and Seal 180gsm Envelopes - Square - 220 x 220mm

White Premium Window Peel and Seal 180gsm Envelopes

Regular price From £0.40
Sale price Regular price
White String & Washer Envelopes - C4 - 324 x 229mm
Eco Product

White String & Washer Envelopes

Regular price
Sale price From £0.65 Regular price £0.72
White String & Washer Gusset Envelopes - C4 - 324 x 229 x 25mm

White String & Washer Gusset Envelopes

Regular price
Sale price From £0.84 Regular price £0.93

More About "Large Letter Size Envelopes"

This collection covers over 175 products suited to a wide range of mailing and packaging applications. The range spans over 305 size options, a range of colour options, paper weights from 20–350gsm, gummed (lick-and-seal) and peel & seal closures.

Product types include: Amazon FBA, Anti Static Bags, Bag, Biodegradable Bags, Board Back Envelopes, Book Wrap Mailers.

Benefits

  • Size variety — over 305 size options across the range.
  • Colour options — a range of colour options available.
  • Closure choice — gummed (lick-and-seal) and peel & seal to suit different workflows.
  • Royal Mail compatible — qualifies as large letter or letter or small parcel within standard weight limits.

Frequently Asked Questions

What types of products are in this collection?
This collection contains over 175 products covering Amazon FBA, Anti Static Bags, Bag, Biodegradable Bags, Board Back Envelopes, Book Wrap Mailers. Use the sort and filter options to find the right product for your specific size, format and quantity requirements.

Are these products Royal Mail compatible?
Yes — products in this collection use standard UK postal formats compatible with Royal Mail's size and weight categories. Always check packed weight before assigning a postage rate.

Trustpilot Verified

What Our Customers Say

See why we’re trusted as by thousands of UK businesses for packaging and envelopes through verified customer reviews.

Read more reviews at Trustpilot

Black and white photo of a person with long hair against a plain background

Aimée Thompson

We ordered some branded envelopes for a client event and they were a perfect addition. Jess and the team were extremely accommodating and attentive throughout the ordering process, pushing our order through to meet the tight deadline. I really recommend this company for branded materials. Thank you team!

Woman with long brown hair wearing a beige top against a plain background

Charlotte Goodman-Brooks

Great Customer Service

Unfortunately my order arrived damaged but after emailing the issue over to the company I received a quick response from Jess who was able to fix the problem in minutes, thanks so much jess, fantastic customer service, will definitely be ordering from this company again.

Man in a suit with a blurred green outdoor background

SR

Great Products, Quick Delivery

DPD were having issues delivering to my address and things were getting frustrating, but the company really stepped up. They sorted the problems with DPD quickly, the replacement arrived super fast, and they refunded my previous order without any hassle. Overall, I’m really impressed – amazing customer service, and I’ll definitely be ordering again!

Woman wearing a yellow sweater with a plain background

Grace

Proactive and Helpful

The courier let us down, but Jess and Kelly were hugely helpful and did everything they could to resolve it. They even arranged to specially stock products I order regularly to make future orders smoother. Great quality, good value and excellent customer service, with the phone answered on the first ring!

Woman with gray hair wearing a blue top against a light gray background

Rebecca R

Really Easy Process

Really easy process to order some custom printed envelopes, James was so helpful and answered all my questions. The envelopes arrived on time and are really great quality, wouldn't hesitate to use this company again!

Man wearing a light gray sweater over a collared shirt on a plain background

Bernie Webber

Great Company To Buy From

Great company to buy from. Very helpful and communicative.


Man wearing a dark suit with a red tie against a plain background

Paul Craig

Prompt and Efficient Service

Very helpful staff directing me to exactly the right item needed.

Man in a suit smiling outdoors with a blurred background

Richard

Fantastic Customer Service

Fantastic Customer Service

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