Packaging guides
Plain, practical guidance on buying boxes in the UK. Written for businesses buying in bulk.
Box Size Calculator Guide: How to Find the Right Box for Your Product
A step by step method for sizing a box to your product, from measuring and adding clearance to choosing the nearest stock size and postage band.
2 Aug 2026Sizing
How to Measure a Box: Internal vs External Dimensions
The difference between internal and external box dimensions, why it matters for what fits, and how to measure correctly in mm.
2 Aug 2026Sizing
Royal Mail PiP Sizes Explained, and Which Stock Boxes Fit
Royal Mail Large Letter and Small Parcel size limits explained, plus the stock box dimensions that keep you in the cheaper price band.
2 Aug 2026PostalSizing
Single Wall vs Double Wall Cardboard Boxes: Which Do You Need?
A practical guide to choosing between single wall and double wall boxes for ecommerce, based on weight, contents and carrier.
2 Aug 2026Box stylesSizingEcommerce