Custom mailing envelopes with blue geometric print, gusseted sides and a peel-and-seal closure.

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Custom Printed Envelopes

Bespoke printed envelopes with custom sizing, sturdy paperboard, peel-and-seal closures, tear strips and optional pockets for cards or inserts.

Custom Printed Envelopes for Packaging

Custom printed envelopes can do much more than carry a letter.

For product packs, promotional mailouts, cards, printed sets and slim ecommerce items, a bespoke envelope can provide a cleaner and more compact alternative to a conventional box. The dimensions, board, flap, closure and opening method can all be matched to what needs to go inside.

Custom Packly produces custom printed envelopes for brands that need more than standard C4, C5 or DL stationery. Choose the finished size, paper or paperboard stock, print coverage, adhesive closure, tear strip and internal pocket configuration around the actual contents.

This makes the format useful when a custom mailer box feels unnecessarily deep, but a lightweight office envelope does not provide the structure or presentation your product needs.

The result is an envelope designed as packaging rather than stationery.

Choose the Envelope Format

The right structure depends on how the pack will be filled, sealed, opened and handled.

Peel-and-Seal Envelopes

A peel-and-seal adhesive strip creates a quick, clean closure without separate tape.

The protective liner stays over the adhesive until the envelope is packed. Your team removes the liner, folds the flap into place and presses it closed.

This works particularly well for repeat packing where speed matters. The adhesive position can be planned around the flap dimensions so that the seal sits neatly without interfering with artwork or the contents.

Tear-Strip Envelopes

A tear strip gives the recipient a clear opening point.

Instead of pulling apart the glued flap or cutting into the pack, the customer follows the perforated strip to open the envelope in a more controlled way.

For branded mailouts, membership packs, printed kits and ecommerce orders, this can make a simple paperboard structure feel considerably more considered.

The strip should be planned as part of the dieline rather than added after artwork is finished.

Seal and Tear Together

A peel-and-seal strip and tear strip can be used in the same envelope when fast packing and clean opening both matter.

The adhesive secures the outgoing package. A separate perforated section gives the recipient an intentional way into it.

This combination is particularly useful for businesses sending the same format repeatedly because it simplifies both sides of the experience: packing for your team and opening for your customer.

Pocket Envelopes

An extra pocket can separate cards, leaflets, vouchers, instructions or another flat component from the main contents.

For example, the main section might hold a product or printed set while a smaller slip pocket keeps an information card in a fixed position.

The pocket depth, opening direction and board thickness should be settled before the main dieline is approved. Small dimensional changes can affect both fit and how easily the card can be removed.

Gusseted Envelopes

When the contents have more thickness than a completely flat item, a gusset can create extra capacity at the sides or base.

This can work for thicker document sets, booklets, product samples and grouped printed materials.

A gusset is still not a replacement for a protective corrugated box when the product is fragile or heavy, but it can bridge the gap between a flat envelope and a deeper mailing carton.

Paper and Board Choices

Material changes how the envelope folds, feels and protects the contents.

Paper Envelopes

Lighter paper stocks suit correspondence, invitations, vouchers, paperwork and other uses where structural stiffness is not the main requirement.

They are efficient when the contents already provide their own rigidity and the envelope mainly needs branding, organisation and closure.

Paperboard Envelopes

Paperboard gives custom printed envelopes a firmer, more packaging-led feel.

A heavier stock such as 350 GSM paperboard can work well where the envelope needs sharper folds, better stiffness and a more substantial presentation than an ordinary postal envelope.

It can suit cards, promotional packs, flat merchandise, printed product sets and other contents that benefit from extra support.

The heaviest material is not automatically the best choice. Board needs to crease cleanly and work with the flap, adhesive and tear-strip layout.

White Board

White stock gives full-colour artwork a clean base.

It is useful for detailed branding, photography, colour blocks and designs where accurate reproduction matters. It can also make a relatively simple envelope feel much closer to retail packaging than office stationery.

Kraft Stock

Kraft can create a simpler, more natural visual direction.

Dark logos, typography and restrained artwork often work particularly well against the brown surface. Colours can reproduce differently on kraft than on white stock, so the material should be chosen before artwork is finalised.

You can compare wider stock and finishing possibilities through our customisation capabilities.

Print the Whole Pack

An envelope has useful front, back and flap surfaces, so branding does not need to stop at a small logo in one corner.

Outside Printing

Outside print can include your logo, campaign artwork, instructions, patterns, product messaging or full-colour graphics.

If the envelope will carry a courier label, postage information or addressing, those practical areas should be considered when the artwork is positioned.

Inside Printing

The interior can also carry colour, patterns or messaging that appears as the envelope opens.

Inside printing works particularly well with tear-strip packs because the outside remains controlled while the opening reveals a second layer of branding.

CMYK Printing

CMYK is suitable for full-colour artwork, illustrations, photographs and designs using several colours.

It is usually the natural starting point when the envelope needs detailed printed graphics rather than one or two controlled brand colours.

Pantone Colour

Pantone can be considered where tighter control of a specific brand colour matters.

The right printing method depends on artwork, stock, quantity and colour requirements rather than choosing one method for every envelope.

For broader artwork preparation, see How to Design Packaging for a Product.

Add the Right Finish

Finishing can change both the appearance and handling of the envelope.

Matte Lamination

Matte lamination creates a smooth, controlled surface and works especially well with premium paperboard envelope packaging.

It can reduce surface glare and give large colour areas a more refined appearance.

Gloss Lamination

Gloss creates more shine and can make printed colours appear more vivid.

It is useful where brighter visual impact matters more than a softer premium finish.

Foil and Raised Detail

Foil, embossing, debossing and spot UV can highlight selected elements such as a logo or product name.

These finishes work best when they support the design. A custom envelope does not need every available finish to look premium.

For many brands, good stock, strong print and a well-engineered opening deliver more value than adding unnecessary decorative processes.

Size Around the Contents

Bespoke envelopes should be developed from what actually goes inside.

Start with the maximum width and height of the product, card, leaflet or printed set. Then account for the combined thickness of everything that will be packed together.

If there are several components, stack them exactly as they will be supplied to the customer.

Too little clearance can make filling difficult, distort the envelope or place unnecessary pressure on seams and folds. Too much space can allow contents to move and make the packaging feel oversized.

Custom sizing is especially useful when your contents do not match standard stationery dimensions.

You are not restricted to making the product fit a C4, C5 or DL envelope simply because those formats already exist.

Made for Flat Products

Custom printed mailing envelopes work best when the contents are relatively slim and do not require heavy cushioning.

Typical uses include:

Card and information packs
Membership materials
Promotional mailouts
Voucher sets
Event packs
Certificates and documents
Printed photographs and artwork
Product samples
Flat accessories
Launch materials
Instruction sets
Branded inserts
Lightweight merchandise

When a product needs substantial crush resistance, impact protection or deep internal space, another packaging structure will usually perform better.

Envelope or Letterbox Box

Letterbox boxes and paperboard envelopes can both work for slim deliveries, but they solve different problems.

A letterbox box gives the product corrugated walls and a defined depth. It is better when the contents need more edge and corner protection.

An envelope keeps the pack flatter and simpler. It is more appropriate where the contents need organisation, branding and some stiffness rather than a complete protective box.

If the product sits between the two, compare the fully packed thickness before deciding.

Envelope or Book Mailer

Book mailers are designed to wrap more firmly around books, catalogues and similar products.

They provide more structural protection around edges and corners than a simple paperboard envelope.

Choose an envelope when the contents are lighter or when the slim presentation itself is an important part of the pack.

Envelope or Postal Box

Postal boxes provide greater depth and corrugated strength for ecommerce orders.

They make more sense when several items need to be packed together, when the product can move during delivery or when there is enough depth to make an envelope impractical.

A custom printed envelope is the more compact choice for flat contents where additional box volume adds little benefit.

Envelope or Corrugated Mailer

Corrugated mailer boxes should be considered when transit protection is the priority.

Corrugated flute creates stronger walls and better resistance to normal delivery pressure than folding paperboard.

An envelope should not be made unnecessarily thick in an attempt to perform the job of a corrugated mailer. Matching the structure to the product is usually more effective than simply increasing board weight.

You can also compare the wider Packaging Styles when the structure is still undecided.

Design the Closure Early

The closure should be decided before artwork.

A peel-and-seal strip requires a clear adhesive zone. A tear strip needs enough space to perforate cleanly. A pocket creates additional folds and glue areas. Gussets change the flat dimensions of the structure.

Trying to introduce these after the graphics are complete can force important artwork onto folds, glue zones or opening areas.

The dieline should therefore solve the physical envelope first.

Once the cut lines, creases, glue areas, flap, tear strip and pocket positions are confirmed, the artwork can be applied to the correct panels.

Our explanation of packaging dielines covers the main technical areas your designer needs to recognise.

Make Packing Simpler

The best envelope is not only attractive after it arrives. It should also be practical before it leaves.

For repeat fulfilment, think about how the envelope reaches the packing bench, how quickly the contents slide inside, where secondary cards are positioned and how the final flap is sealed.

A few millimetres of additional clearance can sometimes make packing considerably easier. An oversized envelope, however, can create unwanted product movement.

The aim is to find enough room for efficient filling without losing the close fit that makes custom packaging feel deliberate.

For businesses processing larger recurring volumes, peel-and-seal closure can be particularly valuable because it removes the separate taping stage from the packing process.

Control the Opening

Opening is part of the packaging structure.

A sealed flap without a clear opening route may force the customer to tear the board unpredictably or reach for scissors. A correctly positioned tear strip gives them a clear instruction without needing extra printed explanation.

The strip should open the main compartment without catching the contents behind it.

This is particularly important when a card, leaflet or other flat piece sits close to the outer panel. Product position and opening position should therefore be checked together.

A simple feature can make the difference between an envelope that merely contains something and packaging that feels intentionally designed.

Artwork and Dieline Support

You can begin with finished artwork, a logo and rough concept, or simply the product dimensions and a reference image.

Custom Packly provides design support from dieline preparation to 3D mockup, helping establish how the envelope folds and where artwork should sit before production.

If artwork is already available, it can be checked against the final structure.

If the structure still needs development, it is better to approve the envelope layout before adapting the design.

For more complex envelopes with tear strips, adhesive zones, pockets or unusual proportions, a bespoke dieline is more useful than trying to adapt artwork to a generic stationery template.

What Affects the Price

Custom printed envelope pricing depends on the complete specification.

Quantity has a strong effect because production setup is spread across more units as volume increases. Finished dimensions influence material use, while heavier paperboard generally uses more material than lightweight envelope paper.

Other cost factors can include:

Paper or paperboard grade
Finished envelope dimensions
Quantity
Outside or inside printing
Print coverage
CMYK or specialist colour requirements
Peel-and-seal adhesive
Tear-strip construction
Internal pockets
Gussets
Lamination
Foil or other finishing
Custom sampling

A simple printed envelope and a laminated 350 GSM envelope with an adhesive seal, tear strip and separate pocket are structurally different products even when their overall dimensions look similar.

When comparing quotations, make sure every supplier is pricing the same specification.

Our page on custom packaging costs covers the wider factors that influence bespoke packaging prices.

Production and Samples

Custom printed envelope orders start from 100 units.

Production is in the UK, with a standard production time of 6–8 working days and free delivery.

Free sample examples of previous Custom Packly work are available if you want to inspect print and material quality.

If you need an envelope produced to your exact dimensions and artwork before committing to the full quantity, a fully custom pre-production sample can be arranged as a paid sample.

For repeat requirements, warehousing and scheduled deliveries can also be discussed rather than receiving every unit from a larger order at once.

What to Send Us

An accurate envelope quote starts with a few practical details:

Contents or product being packed
Finished size if already known
Product width, height and combined thickness if size is undecided
Required quantity
Preferred paper or paperboard
GSM if already specified
Peel-and-seal requirement
Tear-strip requirement
Pocket or gusset requirement
Outside or inside printing
Artwork or logo files
Preferred finish
Delivery postcode
Required delivery date
One-off or repeat requirement

You do not need every technical detail before asking.

A photo of the contents, rough dimensions and an example of the envelope style you have in mind can be enough for us to recommend the next specification.

If you want to prepare everything before pricing, see How to Get an Instant Custom Packaging Quote.

Make the Envelope Part of the Product

A custom printed envelope can sit neatly between lightweight stationery and a full mailing box.

It can stay slim while giving your brand stronger board, accurate sizing, printed presentation, quicker sealing and a cleaner opening experience.

If your project needs a peel-and-seal flap, tear strip, card pocket, unusual size or heavier paperboard, send us the contents, dimensions and quantity rather than trying to force the design into a standard envelope format.

Get a quote and we can help turn those details into the finished envelope structure.

Process

How it works

Your Packaging Journey, From Idea to Production and Delivery

Tell Us Your Specs

Tell Us Your Specs

Provide size, quantity, printing, and finishes.

Get a Fast Quote

Instant transparent pricing, no hidden fees.

Design and Approval

Artwork checks, revisions, and final sign-off.

Produce

Expert manufacturing to meet deadlines.

Ship to Your Door

Hassle-free, flexible delivery options.

Get Your Quote for Custom Printed Envelopes

Share your product details, dimensions, quantity and artwork needs. We’ll help choose the right packaging style and send a clear quote.

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