Large Letter Postal Boxes

Trade Volume Rates

Slim cardboard letterbox boxes that post as a Royal Mail Large Letter (up to 35.3 × 25 × 2.5 cm and 750 g) and fit through most letterboxes, so parcels arrive even when nobody is home. Three 20 mm deep sizes from 220 × 155 mm to 320 × 230 mm, for flat items such as jewellery, socks, cards and small books.

New range: these sizes are being sourced and are marked out of stock until they arrive. Final dimensions, board grade and pack quantities will be confirmed with stock. Contact us for availability and trade quotes.

Select dimensions and view tiered volume rates. Enter required pack quantities below.

Large Letter Postal Boxes prices by size. Each price is per unit, excluding VAT. Choose a price to set that quantity, or enter a quantity in the last column.
Info	Length × Width × Height	Box type	Price per:			Enter no. of units
Info	Length × Width × Height	Box type	1-4Packs	5-9Packs	10+Packs	Enter no. of units
	220 × 155 × 20 mm A5 items, cards and small gifts	Letterbox (Large Letter)				Out of stock
	240 × 170 × 20 mm C5 items and small clothing	Letterbox (Large Letter)				Out of stock
	320 × 230 × 20 mm A4 documents, prints and slim clothing	Letterbox (Large Letter)				Out of stock

Packaging assistant

Not sure which size or grade you need?

Ask about materials, sizing and specifications for Large Letter Postal Boxes. Prices and volume rates are in the table above, and the guides below cover the common choices.

All packaging guides

About Large Letter Postal Boxes

Large Letter postal boxes are shallow boxes built around Royal Mail's Large Letter size, which is usually far cheaper to post than a parcel. Because they fit through a standard letterbox, the delivery doesn't need a signature or a trip to the depot, which customers like.

3 sizes, all 20 mm deep: 220 × 155 × 20 mm, 240 × 170 × 20 mm and 320 × 230 × 20 mm
Royal Mail Large Letter limit: 353 × 250 × 25 mm and 750 g, including the packaging
Good for jewellery, socks, face masks, cards, prints, small books and other flat items
All sizes are listed as length × width × height; final external sizes, board grade and pack quantities are confirmed when stock arrives

Weigh the packed box before you buy postage: a Large Letter over 750 g, or thicker than 25 mm, is charged as a parcel. Our Large Letter size guide explains the limits. For items that are too thick, see our mailer boxes.

This range is new and is being sourced now. Contact us for availability and trade quotes.

How the volume pricing works

The price per pack drops as you order more of one size. The rate is set by the number of packs of that size on your order:

1-4 Packs: 1 to 4 packs
5-9 Packs: 5 to 9 packs
10+ Packs: 10 packs or more

Choose a price in the table, or open a size's product sheet, to see the rate for your quantity before you add it to the basket.

Sizes: 3 (0 in stock)
Category: Postal Boxes