Mailer boxes and shipping boxes are the two most common eCommerce formats, and choosing the wrong one means either overpaying for protection or under-protecting your product. This guide compares them directly so you can specify the right one.
What is a mailer box?
A mailer box is a one-piece corrugated box with self-locking wings — usually a roll-end tuck-front (RETF) — that ships without tape. It is the format most DTC and subscription brands choose because it protects product, folds flat for storage, and gives a full canvas for custom printed packaging on all six panels. E-flute and B-flute mailers are rated to ship on their own through all major carriers.
What is a shipping box?
A shipping box is a corrugated carton — typically a regular slotted container (RSC) — built for freight strength rather than presentation. It is specified by ECT or burst strength rating, comes in single, double or triple-wall, and is the choice for heavy, fragile or multi-item orders. It usually requires tape and is printed with flexo or litho-lamination rather than digital.
Key differences
- Construction: mailer is one-piece self-locking; shipper is a taped RSC
- Strength: shipper is rated by ECT/burst for heavier loads; mailer for parcel weight
- Print: mailer favours digital edge-to-edge; shipper favours flexo or litho-lam
- Assembly: mailer needs no tape; shipper needs taping at pack-out
- Cost: mailer costs more per unit but removes tape and void fill; shipper is cheaper at volume
Which should you choose?
Choose a mailer box for single parcels under roughly 30 lb where unboxing and branding matter — subscriptions, DTC, beauty, apparel. Choose a shipping box for heavier, fragile or multi-item freight where protection is the priority. Many brands use both: a mailer for single orders and a shipper for bulk or wholesale. We can gang both on the same run to reduce setup cost.
Related packaging
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