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A mailer box that fits badly costs money twice — once in damaged products, once in shipping. Here is how to measure and pick the right size.
Published 2026-11-03
Fit is decided by the inside of the box, not the outside. Measure your product first — length, width, and depth — then pick a box whose inside dimensions hold it with a little room for padding. Dimensions are always written in the same order: Length × Width × Depth.
Inside dimensions decide whether your product fits. Outside dimensions affect shipping costs, because some carriers use dimensional weight. The two are never the same — board thickness sits between them.
These are sizes you will commonly see for e-commerce mailers. They are examples only, not a stock list — any size can be made to order, and final sizes are confirmed during quoting. Common examples: 6 × 4 × 2 inches for jewelry and small accessories; 8 × 6 × 4 for cosmetics and small electronics; 9 × 6 × 4 for skincare sets and apparel accessories; 10 × 8 × 4 for folded apparel and books; 12 × 9 × 4 for shoes and larger apparel items; 14 × 10 × 4 for bulkier items and gift sets. If none of these matches your product, that is normal — most brands end up with a custom size.
Measure the product, then add room for whatever goes around it: tissue, an insert, or protective fill. A snug fit with light padding beats a loose box every time — in a loose box the product slides in transit, and that is how corners get crushed. If you are unsure, order a sample and test the fit before committing to a full run.
Too big, and you pay twice: the product moves and risks damage, and the larger box costs more to ship. Too small, and the box bulges, edges crush, and returns follow. Right-sizing is the cheapest protection you can buy.
Share your product dimensions in the quote form and the box is made to your size. If you are not sure yet, tick 'Not sure yet — help me with sizing' in the form — size selection is part of the specification review, and final sizes are confirmed during quoting.
Request a quote with your product dimensions — or tick 'Not sure yet' and we will help with sizing.
Tell us about your product — we’ll take it from there.
