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UK Based
Free Next Day Delivery
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UK Based
Free Next Day Delivery
Royal Mail Large Letter PIP Cardboard Postal Boxes
Brown & White single wall die cut size boxes for the royal mail 'large letter' postal system
High quality UK manufactured corrugated boxes (0427 style)
Boxes are really easy to assemble with, fold over ends and "earlock" lids
High quality presentation boxes in the below sizes :
C6 Size - Internal =160x110x20mm & External = 166x114x22mm
C5 Size - Internal = 222x160x20mm & External = 228x164x22mm
C4 Size - Internal = 332x245x22mm & External = 332x245x24mm - (This is the Max size allowed by royal mail as a "large letter")
Frequently Asked Questions
What is a Royal Mail 'large letter' PIP box?
A PIP (Pricing in Proportion) box is a die cut cardboard box designed to fit Royal Mail's "large letter" postal category, helping keep contents flat and protected while qualifying for large letter postage rates rather than the more expensive parcel rate. Our C4, C5, and C6 sizes are specifically designed to meet Royal Mail's size guidelines.
What's the difference between C4, C5, and C6 die cut boxes?
The sizing follows standard envelope dimensions — C6 is the smallest (160x110x20mm internal), C5 is mid-sized (222x160x20mm internal), and C4 is the largest (332x245x22mm internal), which is also the maximum size Royal Mail allows for their large letter postal rate.
How do I assemble a die cut postal box?
Our die cut boxes are designed for quick, tool-free assembly with fold-over ends and an "earlock" lid mechanism, making them fast to pack for mail order and eCommerce dispatch without needing tape to close.
What sizes do brown and white die cut boxes come in?
Beyond the Royal Mail PIP sizes, our brown and white die cut boxes are available in a full range of sizes from 5x4x3" up to 17x13x6", giving you options for anything from small accessories to larger, bulkier postal items.
Can I buy die cut boxes in bulk for my mail order business?
Yes, our die cut boxes are available in pack sizes from 5 up to 500 boxes, making them a cost-effective packaging solution for mail order companies and eCommerce businesses with regular postal shipping needs.
