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C3 / A3 Envelope Stiffeners / Layer Pads - 439mm x 309mm

  • C3 / A3 Envelope Stiffeners / Layer Pads - 439mm x 309mm
  • Product Code: STIFF-C3#
  • £0.00

FREE SHIPPING on orders over £30 (ex VAT) to Most UK Mainland Addresses
Orders placed after 3.00 pm may not be shipped on the same day

Available Options


C3 / A3 Envelope Stiffeners - 439mm x 309mm

(Double Wall Envelope Stiffeners)

Our A3 envelope size stiffeners provide a flexible way to further protect the contents of your envelopes and our C3 / A3 Size ParcelMax Mailers. You can choose to include them for the more delicate items you are posting or leave them out if they take your item into a higher postage band.

Choose our extra strong double wall C3 / A3 Envelope Stiffeners / Layer Pads for Increased strength with your A3 mailings or select an envelope stiffener from our other sizes.


C3 / A3 Envelope Strengthener Specification:

Size: 439mm x 309mm C3 / A3 Envelope Stiffeners

Board Grade: 125T/125T EB Flute (Double Wall)

Weight: 86g appx

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Shipping Rates & Upgrades


FREE SHIPPING ON ORDERS OVER £30 (ex VAT)...
so no nasty surprises at checkout.

With the vast majority of items listed on this site being supplied without an additional charge for postage on orders over £30 NET .

The only time you may have additional charges is when you’re buying bulk quantities, very large items or you’re located offshore or in certain parts of the Scottish Highlands.

Please note that we cannot deliver to PO boxes.

Please check here for Offshore and Scottish Highlands shipping upgrades

If you require a faster delivery, click here for timed shipping upgrades

If you are ordering outside of the UK, please click here to see our international rates

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