DISPATCHING AS NORMAL. POTENTIAL FOR COURIER DELAYS, PLEASE ALLOW 1-3 WORKING DAYS FOR DELIVERY. SEE DELIVERY INFO HERE.

Cardboard Envelopes

Cardboard envelopes, also known as all board mailers, provide strong bend resistance and reliable protection for flat items during postage. Made from rigid 350gsm board with a secure peel-and-seal closure, they are ideal for important documents, certificates, photographs, small art prints and other items that should not be creased in transit.

Available in a range of sizes from small square formats to large envelopes suitable for A3 posters, these rigid mailing envelopes keep contents flat from dispatch to delivery. Their plain manilla finish makes them easy to label or overprint for branding. Fully recyclable, they are a practical choice for reducing plastic use in your postal packaging.

Showing all 7 results

All Board Mailer Envelopes 120mm x 120mm

All Board Mailer Envelopes 120mm x 120mm

£3.95 Ex VAT £4.74 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

120mm x 120mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 245mm x 170mm

All Board Mailer Envelopes 245mm x 170mm

£4.45 Ex VAT £5.34 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

245mm x 170mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 265mm x 210mm

All Board Mailer Envelopes 265mm x 210mm

£4.95 Ex VAT £5.94 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

265mm x 210mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 249mm x 352mm

All Board Mailer Envelopes 249mm x 352mm

£5.95 Ex VAT £7.14 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

249mm x 352mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 345mm x 260mm

All Board Mailer Envelopes 345mm x 260mm

£6.45 Ex VAT £7.74 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

345mm x 260mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 370mm x 285mm

All Board Mailer Envelopes 370mm x 285mm

£7.95 Ex VAT £9.54 Inc VAT Order by 3pm, delivered Next Working Day
Internal Dimensions

370mm x 285mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page
All Board Mailer Envelopes 445mm x 310mm

All Board Mailer Envelopes 445mm x 310mm

£8.95 Ex VAT £10.74 Inc VAT Out of Stock – Due back on Friday 20th March 2026
Internal Dimensions

445mm x 310mm
Colour

Manilla
Select options This product has multiple variants. The options may be chosen on the product page

FAQs

Our cardboard envelopes range from compact options ideal for small postcards or stickers to larger formats that can hold A3 posters or multiple documents. This allows you to choose the perfect fit for your items while keeping weight and postage costs low.

They’re ideal for sending documents, certificates, art prints, stickers, or other flat items that must stay rigid during transit. The 350gsm board construction helps prevent bending and surface damage.

Yes. The plain manilla exterior can be easily printed, labelled, or stamped, giving you the option to add your branding for a more professional presentation.

All of our cardboard envelopes feature a peel-and-seal strip for quick packing and a strong adhesive bond, ensuring contents remain secure until opened by the recipient.

Large and Small Cardboard Envelope Packaging

Our cardboard envelope packaging range is designed for both everyday postal needs and specialist applications where presentation and protection matter. Smaller sizes are perfect for postcards, stickers or photographs, while the largest formats provide a flat-pack solution for posters, plans or marketing materials without the need for rolling.

All envelopes in this range feature a quick-seal closure for efficient packing and are made from thick board to withstand handling during delivery. For longer items or high-volume poster shipping, our postal tubes offer an alternative format. We also supply complementary postal packaging in a range of sizes and finishes to coordinate with our cardboard envelopes, helping you keep a consistent and professional appearance across all deliveries.