How to Measure Luggage: A Step-by-Step Guide

Measure the bag you will bring to the gate, after packing. Keep the outside size, the packed weight and the exact configuration together; an advertised capacity or a smaller empty bag is a different measurement.

1. Pack and close the bag

Put in the items you intend to carry, close all zips and fill the pockets as you will use them. Keep an expandable zip in the setting you plan to fly with. A water bottle or jacket attached outside changes the outline: include it or move it inside before measuring.

If your bag expands, record the unexpanded and expanded configurations separately. Do not add a number of litres to one external dimension or infer an expanded box from a photograph.

2. Measure the three outside spans

Use a tape and two flat reference surfaces if the outline is rounded. Measure between the furthest points rather than along a curved seam. Include wheels, fixed handles, handle housing and packed pockets. A telescopic handle should be in its stowed travel position; its fixed housing still counts.

Record all three values in centimetres or inches. Labels such as height/length differ between manufacturers; CarrySizer can compare the bag in its best rotated orientation. Rotation changes the orientation, not the physical size or the allowance.

3. Weigh each packed item

Weigh the main bag and the under-seat item individually. Keep the empty manufacturer's weight as product information, not the weight of your packed bag. Add anything purchased before boarding and reweigh when the contents change.

Where the airline has a combined cap, add the relevant packed items. Where it also specifies a cap per piece, check both. Missing numerical limits require confirmation rather than a guessed allowance.

4. Enter the correct roles and fare

Open the bag checker, enter the packed main bag and choose the operator, class and baggage option. Enable Check both bags together for a separate personal item. For different operators, use the route checker and keep every flight present.

A close-to-limit result is a reason to measure carefully. It does not add a tolerance to the airline's maximum or guarantee cabin space. If a published limit is exceeded, repack and remeasure or arrange the baggage service actually offered for the booking.

Keep a short measurement record

• Exact model/version and the expansion setting.
• Packed outside dimensions, units and each bag's weight.
• Which fare and operating airlines you checked.
• Any missing dimensions, shared-weight rule or booking exception to confirm.

Save the route parameters on this device if useful, then recheck before departure. See size-chart interpretation, combined-weight examples and personal-item roles.