Corrugated Mailer or Shipping Carton: What to Specify

A mailer can be the customer-facing outer pack, an inner presentation pack or one component inside a shipping carton. State which role it serves. If the printed mailer travels directly through parcel handling, its surface and closure face different exposure from a mailer protected by an outer case.

List every component that ships: primary product, retail carton, insert, accessories and paperwork. Determine the packed arrangement before confirming internal dimensions. Too little room can compress a retail box; too much room can allow movement unless the inner protection is designed to control it.

Use an agreed drawing or a FEFCO design code to communicate construction. FEFCO describes its code as a common system for identifying corrugated designs. Add dimensions and board requirements to the drawing; the design identifier alone is not a performance specification.

Flute profile describes part of the board construction. It does not describe the whole combination of liners, medium, board properties and box geometry. Ask the supplier to state the construction and the relevant board or box performance requirement agreed for the application. Do not select a shipping pack from appearance or GSM alone.

A printed or laminated outer surface can affect cost, finish and handling. Compare these choices after the protective system is defined. For material terminology, read the board specification guide. Avoid substituting a visually similar board without checking whether the agreed construction has changed.

An insert that looks tidy may still let a heavy bottle move. Define support positions, separation between fragile items and removal access. Confirm the actual tape, seal or other closure used for shipment. Testing an empty box, or a box closed differently from production, does not evaluate the intended packed product.

Illustrative decision: a skincare set containing a glass jar and a tall pump bottle may need separate support zones. This is a design consideration, not evidence of a completed test. Review insert material choices before fixing the cavity geometry.

ISTA distinguishes integrity, partial-simulation and general-simulation test procedures. Select an appropriate procedure with the customer and testing provider based on the route and packed product. A convenient test name should not replace a description of how the goods will actually travel.

• Record the packed weight, dimensions, product version and number of items.
• Identify parcel, palletized or other handling stages and any customer-specific requirements.
• Agree acceptable product condition and packaging damage criteria before testing.
• Use representative products, inserts, board and closures.
• Record failures and changes, then decide what needs evaluation again.

No universal drop height, board grade or damage allowance is specified here. Those decisions belong to the agreed test plan.

Ask for box, insert, printing, tooling and packing assumptions to be identifiable in the quote. A smaller outer box may reduce shipment volume but create handling problems if clearance or protection is removed. Compare the packed dimensions and complete protection system, not just an empty-box unit price.

For freight-volume planning, continue to the packed-volume comparison guide. Record any later board or product change so the original approval is not applied to a different configuration.