If a journey with connecting flights includes 'BA' and other airline codes, your baggage allowance is generally determined by the airline that operates the longest flight in your itinerary. SUN-AIR: You can take 1 checked bag up to 90 x 75 x 43cm (35.5 x 29.5 x 16in) and 23kg (51lb).
There are size constraints, when flying economy with United, the maximum size for a free checked box is 50 pounds and a total of 62 inches (length + width + height) on the outside. Lucky for me, the weight of the box wasn't a problem, but the size came in an inch or two under the total. I measured it several times at home, though at the airport
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carton box size for international flight