Royal Mail PIP Boxes from Reuseabox

PIP stands for Pricing in Proportion. This is Royal Mail’s system where the cost of postage is determined by the size and weight of your item. In plain English: get your box dimensions right, and you pay less to post. Our Royal Mail PIP boxes are designed to hit those exact dimensions. This is so your postage costs stay as low as possible without any guesswork.

What is a Royal Mail PIP box?

Royal Mail PIP boxes, sometimes called large letter boxes, are postal boxes sized to fall within Royal Mail’s defined pricing bands. They’re designed to fit through the 25mm slot that Royal Mail classes as a large letter, This then unlocks the cheaper large letter postage rate. Miss that slot and you’re paying small parcel rates. Hit it, and you’re not.

Our range of Royal Mail PIP postal boxes

We stock seven sizes of Royal Mail PIP boxes to cover the full spectrum from tiny to large letter maximum:

Our Mini PIP postal box (101 x 101 x 20mm) is ideal for small, flat items like jewellery, accessories, and gift cards. Step up to the A6/C6 PIP postal box (163 x 112 x 20mm) or the DL PIP postal box (218 x 108 x 20mm) for anything that needs a more envelope-sized fit. The C5 PIP postal box (229 x 159 x 20mm) works perfectly for A5 documents, cosmetics, and small books. And then we have our C4 PIP large letter box (340 x 235 x 20mm), available in both brown and white. These handle A4-sized items right up to the large letter limit. For anything slightly chunkier, the Midi PIP small parcel box (334 x 202 x 66mm) steps outside the large letter category and into Royal Mail’s small parcel pricing band, giving you more depth without moving to a full-size shipping box.

Flat-packed and ready to go

All our Royal Mail PIP boxes are supplied flat-packed for easy storage and fast assembly. This is useful whether you’re packing one order or a hundred. They’re made from strong single wall cardboard and lightweight enough to keep you within Royal Mail weight limits. They are also sturdy enough to protect what’s inside.

Who are they for?

Royal Mail PIP boxes are popular with e-commerce businesses, small retailers, crafters, and anyone posting regularly via Royal Mail who wants to keep shipping costs under control. That means if you’re sending books, prints, cosmetics, clothing accessories, stationery, gifts, or anything similarly flat and light, a PIP-compliant postal box is one of the easiest ways to reduce your cost per shipment.

Why Reuseabox?

We’re a B Corp certified business with fast nationwide delivery. We also have a track record our customers are happy to shout about. Browse our full range of Royal Mail PIP postal boxes. Or get in touch if you need help finding the right size.