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How big is 45 linear in or 115 cm (L+W+H)?

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My sister is leaving for HKG on CO Thursday (I am on AA/CX) and she has asked me if she can take her small carry on suitcase with her on her flights.
The CO site says 45 linear in or 115 cm (L+W+H) but we cannot figure out what the heck that means.
Is that a standard 20 or 21 inch rolling bag?
I have no clue... and I only carry a backpack on flights.

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