Lil Flatpack Heavy Duty Corrugated Envelope

As heavy duty envelopes, Flatpacks are the perfect extra-strong way of shipping flat items through the post in a safe, reliable, consistently attractive and cost-effective way.

Our strong corrugated cardboard envelopes feature highly-stiffened corners, reinforced edges and our hot-melt peel ‘n’ seal and tear-strip combination. 100% FSC™ certified. Favoured by illustrators and artists on Etsy (just take a peak at out our instagram).

Highly recommended for:

  • Vinyl Music (EP’s and LP’s)
  • Gadget Accessories, Books, Stationary, Couriered Items
  • Artwork, Picture Frames, Illustrations, Maps & More

To filter through all of our packaging, please click here.

  • corrugated cardboard shipping wallets with expanding sides - eco friendly alternative to jiffy bags

    F-LTR expandable corrugated envelope

    239 x 164 x 0-50 mm
    from £10.25 Each (ex VAT)

    Single unit price from £0.23 Great pocket style corrugate envelope, thanks to expanding sides it's perfect for posting out thick reports, stacks o...

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  • F-EP Flatpack

    F-EP Flatpack

    225 x 205 mm
    from £9.60 Each (ex VAT)

    Single unit price from £0.24 Are you looking for stiff vinyl 7" EP mailer packaging for your vinyl records? If you're using stiffeners, void-fill ...

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  • F2 expandable corrugated envelope

    F2 expandable corrugated envelope

    317 x 234 x 0-80 mm
    from £24.08 Each (ex VAT)

    Single unit price from £0.29 Great pocket style corrugate envelope, thanks to expanding sides it's perfect for posting out thick reports, stacks o...

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  • F3 Flatpack Large Letter Size
    Sold out

    F3 Flatpack Large Letter Size

    352 x 249 mm
    from £14.40 Each (ex VAT)

    Single unit price from £0.36 353 x 250 x 25mm is the maximum size for the Royal Mail's Large Letter size limit. Royal Mail Large Letter size maile...

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  • FLP Flatpack
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    FLP Flatpack

    343 x 343 mm
    from £12.60 Each (ex VAT)

    Single unit price from £0.32 Are you looking for a stiff 12" LP record mailer for your vinyl records?  If you're using stiffeners, void-fill or ai...

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  • F5 Flatpack

    F5 Flatpack

    445 x 325 mm
    from £22.20 Each (ex VAT)

    Single unit price from £0.54 Looking for small parcel corrugated cardboard envelopes to maximise the Royal Mail small parcel size limit of 450 x 3...

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  • F8 Flatpack

    F8 Flatpack

    675 x 525 mm
    from £69.60 Each (ex VAT)

    Single unit price from £1.62 If you're using stiffeners, void-fill or airbags in your packaging, there is usually a better way to package what you...

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  • black envelope wallet cardboard luxury

    FK1 Black expandable corrugated envelope

    206 x 114 x 0-50 mm
    from £12.65 Each (ex VAT)

    Single unit price from £0.297 Great pocket style corrugate envelope, thanks to expanding sides it's perfect for posting out cosmetics, thick repor...

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