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A4 Hardback Envelopes Comparison - April 2026

6 Best A4 Hardback Envelopes In the UK

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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Model

125Pcs 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

Brand

iSOUL
Brand
iSOUL
Brand
Postmaster
Brand
iSOUL
Brand
iSOUL
Brand
Postmaster

Reviews

50 reviews
Reviews
50 reviews
Reviews
914 reviews
Reviews
5,180 reviews
Reviews
5,180 reviews
Reviews
914 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
    1
    iSOUL

    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.
  • 9.5
    2
    iSOUL

    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
    3
    Postmaster

    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)

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Value for money

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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.

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