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Form MB-01 · Cabin allowance declaration

Frames read October 2026

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Box 03 · the tape

Ninety seconds with a tape beats an argument at the gate.

Every carrier on the schedule measures a box, not a bag. That single fact explains most of the confusion at boarding: a bag advertised as 55 cm is often 59 cm once the wheels are counted, and the sizer at the gate does not care what the listing said.

Diagram of a cabin bag with the three measured sides labelled A, B and C A B C WHEELS COUNTED FIG. 1 — THE THREE SIDES
The three sides are read at the widest point of a packed bag. Sort them largest first before comparing with a frame.
01

Pack it first

An empty soft bag measures smaller than the same bag on the way home. Fill it the way you intend to fly, close it, then measure.

02

Three sides, widest point

Height, width and depth at the bulging point, not along a flat seam. A soft bag that swells two centimetres in the middle is two centimetres over.

03

Include the protrusions

Wheels, handles, side pockets and the trolley sleeve all count. Scoot and AirAsia say so explicitly; the others simply measure the whole object.

04

Weigh the pair

Most 7 kg ceilings cover the cabin bag and the personal item together. A hanging scale, packed bag, both pieces, one reading.

The four traps that catch people

A 20-inch case is not a 55 cm case

Inches are measured on the shell in some catalogues and on the whole case in others. A case sold as 20 inches can arrive at 57 cm with the wheels, which is over on the length for every carrier on the schedule.

Soft bags pass where hard shells fail

A frame is rigid. A soft bag can lose two centimetres when it is pushed into a sizer; a polycarbonate shell cannot lose any. If your bag clears by one or two centimetres, prefer the soft one.

The personal item is measured too

It is the second most common gate surprise. Scoot caps it at 40 × 30 × 10 cm, AirAsia and VietJet at the same, Cebu Pacific at a narrow 20 × 20 × 35 cm. A day pack that swallows a laptop rarely fits any of them.

The weight is the pair

Two pieces at 3.6 kg each are 7.2 kg. The bag can be perfectly sized and still fail the only test the gate actually performs with a scale.

Test your own numbers in the assessment box. It compares the sorted sides against the carrier's sorted frame and reports the tightest margin, which is the same arithmetic the plates on the shelf use.

Shelf · measured cases

Every case on the shelf has been through this

Open the case shelf