Packaging Guide: Large Letter

Large letter postal boxes can be highly beneficial for eCommerce businesses as they are cost effective, convenient for your customers and significantly reduces the risk of “failed to deliver” returns.

These boxes are perfect for shipping a wide range of items, from subscription boxes to items such as t-shirts/clothing, DVDs, magazines and small electrical items.

Large Letter Package Sizing

Our large letter postal boxes come in two sizes. These are both compatible with Royal Mail’s large letter guidelines and most UK letterboxes.

C5 Large Letter PIP Postal Box

9.02 x 6.26 x 0.63″ (229 x 162 x 20mm) From 19.4p per box

C4 Large Letter PIP Postal Box

12.83 x 8.94 x 0.63″ (324 x 229 x 20mm) From 27.8p per box

The dimensions given refer to the internal dimensions of the box and you can send packages that weigh up to 750g.

Large letter packaging guide graphic

How to Pack and Secure Your Package

Our large letter postal boxes are made out of top-quality boards that are delivered flat-packed to reduce storage space before use. They can be easily assembled and are designed to be sturdy, ideal for going through the letterbox.

To Assemble and Pack:

  • Start by laying the box in front of you
  • For each indentation, fold the cardboard inwards, then you’re ready to pack
  • Place the product flat in the box
  • If the product does not fill the whole box we recommend filling the excess area with eco-friendly padding to protect your product
  • Once you have closed the box, secure it by taping around the edges of the lid

Simple as that!

Key Benefits

  • Cost effective
  • Reduces excess packaging
  • Convenience for your customer
  • Plastic free and 100% recyclable
  • Made in Britain

Cost to Send Large Letter Postal Boxes

  • 100g =£2.10
  • 250g = £2.90
  • 500g = £3.50
  • 750g = £3.50

Our boxes come in packs of 50 and you can order as many as you like. Plus, there is a bulk buy discount when purchasing 600 or more boxes.