Royal Mail PiP Postal Box Size Guide
15 Juil 2026, 10:31 AM
Choosing the right postal box can help protect items while keeping a package within Royal Mail's Large Letter dimensions. PiP postal boxes are available in a range of practical formats, including C7, C6, DL, C5 and C4, with slim depths designed to help packages remain within the relevant postal limits. This guide explains the common sizes and how to choose the most suitable format.



















