Packaging Supplies
C4 & C5 Hardbacked Manilla Do Not Bend Envelopes
Rigid manilla hardbacked envelopes in C4 and C5 sizes, printed with a clear red 'Please do not bend' message. Supplied as convenient multipacks for documents, certificates, photographs, prints and other flat postal items.
£3.98
£0.40 each
In stock224 available
Free delivery over £10.00, otherwise £2.00. United Kingdom only.
- Rigid board backing helps keep documents flatter and better supported during normal postal handling
- Red 'Please do not bend' print clearly alerts handlers that the contents should remain flat
- Helps reduce the risk of unwanted folds, creases and damaged document corners
- C4 and C5 choices cover common document and postal requirements
About this product
C4 and C5 manilla hardbacked postal envelopes with rigid board support and a clearly printed red 'Please do not bend' warning. Choose C4 or C5, in packs of 10, 25, 50 or 100.
Hardbacked Manilla Envelopes give important documents and flat items the additional support they need when being sent through the post.
More protection than an ordinary envelope
Standard paper envelopes offer very little resistance to bending. These hardbacked mailers combine a manilla outer with a rigid board backing that helps support the contents and keep them flatter during normal handling. They are a practical choice whenever a crease, fold or damaged corner could spoil the presentation of what you are sending.
Printed 'Please do not bend' warning
Every envelope is clearly printed with a red 'Please do not bend' message on the front. This gives postal and handling staff an immediate visual indication that the contents should be treated as a flat item rather than folded or bent with ordinary correspondence.
C4 and C5 options for different documents
Choose C4 when you want to send A4 paperwork flat without folding it. It is well suited to certificates, contracts, reports, photographs, prints, artwork and presentation documents. Choose C5 for A5 documents and smaller flat items, or for A4 paperwork that can be folded once before posting.
Supplied as useful multipacks
These envelopes are sold as multipacks rather than individually, making them convenient for offices, online sellers, schools, studios, photographers and households that regularly post documents. Keeping a pack ready means you have a more protective postal option available whenever an ordinary envelope is not quite enough.
Professional, simple and versatile
The plain manilla finish provides plenty of space for address labels, postage and other markings while maintaining a professional appearance. They are particularly useful for ecommerce orders and business correspondence where the condition in which the contents arrive forms part of the customer's overall impression.
Should you choose C4 or C5?
C4 is the better choice when an A4 sheet needs to remain flat. This makes it particularly useful for certificates, important correspondence, contracts, reports, prints and other documents where folding would affect presentation.
C5 is a more compact option for A5 paperwork, smaller prints and photographs, or an A4 sheet that can be folded once. Choosing the closest suitable size also helps reduce unnecessary movement of the contents inside the envelope.
Hardbacked envelope or ordinary envelope?
An ordinary paper envelope is mainly designed to contain documents. If it is bent during sorting, transport or delivery, the paperwork inside can bend with it.
A hardbacked envelope adds a rigid board layer to provide noticeably more support. It is a useful middle ground between a standard envelope and a parcel box, giving flat items additional protection without the bulk of full cardboard packaging.
- Certificates and qualifications
- Contracts and legal paperwork
- Business documents
- A4 and A5 paperwork
- Photographs and prints
- Artwork and illustrations
- Brochures and presentation material
- Reports and forms
- Ecommerce orders
- School and university documents
- Office correspondence
- Flat printed products
Benefits
- Rigid board backing helps keep documents flatter and better supported during normal postal handling
- Red 'Please do not bend' print clearly alerts handlers that the contents should remain flat
- Helps reduce the risk of unwanted folds, creases and damaged document corners
- C4 and C5 choices cover common document and postal requirements
- Multipack format is convenient for regular office, ecommerce and home posting
- Professional manilla finish suits customer orders and business correspondence
- Provides more support than a standard paper envelope without requiring a bulky parcel box
- Peel and seal closure, so the flap is pressed shut by hand with no moisture and no tape
- Two sizes and four pack sizes, from 10 for occasional post up to 100 for a dispatch bench
Features
- Rigid hardbacked construction
- Manilla paper outer
- Board reinforced back
- Red 'Please do not bend' print
- Available in C4 and C5 formats
- Supplied as multipacks
Specifications
- Brand
- SupaGrip
- Material
- Manilla paper with rigid board backing
- Backing
- Rigid board
- Colour
- Manilla brown
- Pack quantity
- 10, 25, 50 or 100 envelopes
- Sizes
- C4 324 x 229mm, or C5 229 x 162mm
- Pack sizes
- 10, 25, 50 or 100 envelopes
- Closure
- Peel and seal, with a pull-off release strip
- Printed warning
- Please do not bend, in red on the face
How to use
Select C4 when A4 contents need to remain flat, or C5 for A5 contents and smaller items. Place the contents fully inside the supported area, close the envelope securely and apply the delivery address and postage where they can be read clearly. For particularly fragile, valuable or irreplaceable contents, assess whether additional protective packaging is required. To close one, pull the white release strip from the flap, fold the flap over and press firmly along its whole length.
Storage
Store unused envelopes flat in a clean, dry location. Keep them away from moisture, excessive humidity and crushing so the board backing, corners and edges remain in good condition before use.
Frequently asked questions
What are hardbacked manilla envelopes used for?
They are designed for posting documents and other flat items that need more support than an ordinary paper envelope, including certificates, photographs, prints, contracts and business paperwork.
Do these envelopes say 'Please do not bend'?
Yes. The front is clearly printed with a red 'Please do not bend' message so the handling requirement is immediately visible.
What is the difference between C4 and C5?
C4 is the usual choice for sending A4 documents flat without folding. C5 is suited to A5 documents, smaller flat items or an A4 sheet folded once.
Are these envelopes sold individually?
No. They are supplied as multipacks, making them suitable for customers who regularly send documents or keep postal supplies on hand.
Are hardbacked envelopes rigid?
They contain a rigid board backing that gives considerably more support than a normal paper envelope. They are still postal envelopes, however, rather than solid cardboard boxes.
Are they suitable for certificates?
Yes. C4 is particularly useful when an A4 certificate needs to be sent flat without folding, while the board backing provides additional support during handling.
Can I use these for photographs and prints?
Yes. They are a practical option for flat photographs, prints and similar items where bending or creasing is a concern.
Are they suitable for ecommerce businesses?
Yes. They work well for online sellers sending documents, certificates, photographs, artwork, prints and other relatively flat products that need more support than a standard envelope.
What size are C4 and C5 exactly?
C4 measures 324 x 229mm, which takes an unfolded A4 sheet. C5 measures 229 x 162mm, which takes an unfolded A5 sheet or an A4 sheet folded once.
How many envelopes are in a pack?
You choose: 10, 25, 50 or 100. The same choice is offered in both C4 and C5, so a 100 pack is simply more of the same envelope rather than a different one.
How do these envelopes seal?
They are peel and seal. Pull the white strip off the flap to expose the adhesive, fold the flap over and press it down. No moisture and no separate tape are needed.
Delivery and price
- Delivery
- United Kingdom only. Free over £10.00, otherwise £2.00.
- Dispatch
- Sent via Royal Mail.
- VAT
- SupaGrip is not VAT registered, so no VAT is added. The price shown is the price you pay.