Advertising Disclosure A4 Hardback Envelopes Comparison - April 2026
6 Best A4 Hardback Envelopes In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
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| 1 Best Choice  9.7Exceptional | 2 9.5Excellent | 3 Best Value  9.3Excellent | 4  9.1Excellent | 5 8.9Very Good | 6 8.7Very Good |
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Model125Pcs A4 Envelopes iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope | Model 125Pcs A4 Envelopes iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope | Model Postmaster A4 C4 Do Not Bend Board Backed Envelopes Peel Seal 50 Pack,Brown,229x324mm | Model 20Pcs A4 Envelopes Self-Seal iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope | Model 20Pcs A4 Envelopes Self-Seal iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope | Model Postmaster A4 C4 Do Not Bend Board Backed Envelopes Peel Seal 50 Pack,Brown,229x324mm |
BrandiSOUL | Brand iSOUL | Brand Postmaster | Brand iSOUL | Brand iSOUL | Brand Postmaster |
Reviews | Reviews  | Reviews | Reviews | Reviews  | Reviews |
Tech Specs | |||||
product dimensions 34 x 21 x 24 cm 6.61 kg | product dimensions 34 x 21 x 24 cm 6.61 kg | product dimensions 22.9 x 32.4 x 0.05 cm 2.83 kg | product dimensions 32.4 x 22.9 x 0.03 cm 1.08 kg | product dimensions 32.4 x 22.9 x 0.03 cm 1.08 kg | product dimensions 22.9 x 32.4 x 0.05 cm 2.83 kg |
shape Rectangular | shape Rectangular | shape Rectangular | shape Rectangular | shape Rectangular | shape Rectangular |
item weight 6.61 kg | item weight 6.61 kg | item weight 2.83 kg | item weight 1.08 kg | item weight 1.08 kg | item weight 2.83 kg |
number of items 125 | number of items 125 | number of items 50 | number of items 20 | number of items 20 | number of items 50 |
size A4 | size A4 | size Board Backed | size A4 | size A4 | size Board Backed |
manufacturer part number IS-2020-ENVELOPES 10PK | manufacturer part number IS-2020-ENVELOPES 10PK | manufacturer part number RBL10614 | manufacturer part number IS-2020-ENVELOPES | manufacturer part number IS-2020-ENVELOPES | manufacturer part number RBL10614 |
material type Paper | material type Paper | material type Cardstock | material type Fibreboard, Paper, Cardboard | material type Fibreboard, Paper, Cardboard | material type Cardstock |
closure Self-Seal | closure Self-Seal | closure Self-Seal | closure Self-Seal | closure Self-Seal | closure Self-Seal |
paper weight 120 | paper weight 120 | paper weight 120 | paper weight - | paper weight - | paper weight 120 |
color- | color - | color Hardback A4 | color Manila | color Manila | color Hardback A4 |
Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.7
1iSOUL125Pcs A4 Envelopes iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope
Why we love it
Pre-printed 'Do Not Bend' keeps documents safe.
Versatile use for various mailing needs.
Eco-friendly, made from recycled materials.
Main highlights- STRONG & SECURE SELF-SEAL CLOSURE: Features a 10mm wide, high-quality self-adhesive strip for quick, tamper-proof sealing — no need for tape or glue, keeping your contents safe and secure.
- RIGID HARD BOARD PROTECTION: Constructed with a 120gsm kraft paper front and 1000 micron hard board back, these envelopes prevent bending and creases, keeping your documents, photos, and artwork safe and intact during shipping.
- PERFECT A4 FIT & PROFESSIONAL LOOK: A4 Manilla Hard Board Backed Envelopes (324mm x 229mm), designed to hold A4 documents, certificates, photo prints, invitations, and cards without folding. Pre-printed with "Please Do Not Bend" for careful handling and a professional finish. Comes in a value pack of 125.
- Includes: 125Pcs A4 C4 324mm x 229mm Manilla Hard Board Backed Envelopes Do Not Bend Envelope
- Environment friendly as they made from recycled materials.
-
9.5
2iSOUL
125Pcs A4 Envelopes iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope
Why we love it
Pre-printed 'Do Not Bend' keeps documents safe.
Versatile use for various mailing needs.
Eco-friendly, made from recycled materials.
Main highlights- STRONG & SECURE SELF-SEAL CLOSURE: Features a 10mm wide, high-quality self-adhesive strip for quick, tamper-proof sealing — no need for tape or glue, keeping your contents safe and secure.
- RIGID HARD BOARD PROTECTION: Constructed with a 120gsm kraft paper front and 1000 micron hard board back, these envelopes prevent bending and creases, keeping your documents, photos, and artwork safe and intact during shipping.
- PERFECT A4 FIT & PROFESSIONAL LOOK: A4 Manilla Hard Board Backed Envelopes (324mm x 229mm), designed to hold A4 documents, certificates, photo prints, invitations, and cards without folding. Pre-printed with "Please Do Not Bend" for careful handling and a professional finish. Comes in a value pack of 125.
- Includes: 125Pcs A4 C4 324mm x 229mm Manilla Hard Board Backed Envelopes Do Not Bend Envelope
- Environment friendly as they made from recycled materials.
-
9.3
3Postmaster
Postmaster A4 C4 Do Not Bend Board Backed Envelopes Peel Seal 50 Pack,Brown,229x324mm
Main highlights- POSTMASTER - we manufacture millions of Envelopes for some of Britain's biggest Organisations as well as for thousands of small, home based businesses
- PEFC-CERTIFIED FOR SUSTAINABILITY - PEFC is a European based Forest certification system, that allows small- and family forest owners to demonstrate their excellence in sustainable forest management
- HARD BOARD-BACKED PROTECTION - Essential for Important Documents such as legal papers, certificates and for A4 sized material such as Posters or CVs to help prevent damage so your contents remain professional
- DO NOT BEND - written clearly on the Envelope to help ensure your mail gets couriered through the postal system without being folded or damaged
- C4 ENVELOPE - Designed to take sheets of A4 Paper unfolded. Designed to be sent using a single Large Letter 1st Class or 2nd Class Stamp (max 100g)
Our ranking system
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Features
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Consumer Reviews
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Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
