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Mailer Box Sizes Guide: Small, Medium, and Large Compared
Box size drives more than just how your product looks on arrival — it also drives dimensional-weight shipping cost, which most carriers now calculate off the box’s outer dimensions rather than actual weight. Sizing right protects your margin as much as your product.
The three sizes most DTC brands need
| Size class | Typical dimensions | Best for |
|---|---|---|
| Mini | 6 × 4 × 2 in | Jewelry, accessories, samples, add-ons |
| Standard | 12 × 9 × 4 in | Apparel, most single-item e-commerce orders |
| Large | 14 × 10 × 6 in (custom) | Multi-item bundles, bulkier goods, gift sets |
Why “just size up” costs more than you think
A box that’s too large doesn’t just cost more to ship under dimensional-weight pricing — it also needs more void fill, and a loosely packed box is more likely to crush or shift in transit than a snugly sized one. Size to your product plus a small buffer, not to whatever box you happen to have on hand.
Not sure which size fits your product? Get a custom quote and we’ll recommend a style. Browse every mailer box style, or read more guides.