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C4 Large Letter Postal Boxes - Royal Mail PiP Boxes (320mm x 230mm x 21mm)

  • C4 Large Letter Postal Boxes - Royal Mail PiP Boxes (320mm x 230mm x 21mm)
  • Product Code: LL-C4PIP#
  • £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

Defenda C4 Large Letter Boxes

These top quality C4 Large Letter PiP Postal Boxes (often called A4 Large Letter Boxes or simply C4 or A4 PiP Boxes) are designed to provide superior levels of protection & huge savings when used to send items out as Large Letters with Royal Mail.

Large Letter Boxes

If you are looking for the cheapest prices on other sizes of quality Large Letter Postal Boxes then see our full range of Large Letter Royal Mail Pricing in Proportion PiP Boxes.


These C4 Large Letter Postal Boxes are manufactured by us here in the U.K. — so they don’t clock up huge amounts of import miles. They are produced using recycled & recyclable material & no bleach is used in their production.

Royal Mail Small Parcel Sized Boxes

Small Parcel Boxes in a range of sizes that conform to Royal Mail Small Parcel size restrictions are also available check out our Small Parcel Postal Boxes.

C4 PiP Postal Box --- Royal Mail Large Letter Size Postal Box Specification:

Internal Dimension - 320mm x 230mm x 21mm
Board: E flute
Individual unit weight: 82g (appx)

Like all of our Large Letter Size Postal Boxes or PiP Boxes, these C4 PiP boxes are manufactured using quality board in an E flute --- maximising the strength of the box whilst leaving the sufficient space in the box for contents.

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Shipping Rates & Upgrades

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