Air China uses the piece concept for International Carriage.
Standard baggage: Each piece of baggage whose total dimensions (length + width + height, including wheels and handles) , should not exceed 158 cm (62 in) and should not be less than 60 cm (24 in).
Each piece of baggage whose total dimensions (length + width + height, including wheels and handles), should not exceed 203 cm (80 in) and should not be less than 158 cm (62 in), excess baggage fees must be paid .
First/Business Class adult and child passengers may check in two pieces of baggage for free, each weighing up to 32 kg (70 lb).
Premium Economy Class passengers are entitled to check two pieces of ordinary baggage for free, each piece of baggage weighing up to 23 kg (50 lb).
①Economy Class passengers traveling on the following routes may check in one item of baggage for free weighing up to 23 kg (50 lb):
Routes between Hawaii and the Americas, the Caribbean, Europe, Africa, the Middle East, Asia, and the Southwest Pacific.
Routes between Europe, Africa and Asia (except Japan, Pakistan, Singapore, Kazakhstan).
Routes within Asia (except Japan, Pakistan, Singapore, Kazakhstan). Other routes not listed.
(Note: Asia includes mainland China, Hong Kong, Macao and Taiwan, excluding the Middle East and the Southwest Pacific.)
② Economy Class passengers traveling on the following routes may check in two items of baggage for free, each weighing up to 23 kg (50 lb):
Routes between the Americas and the Caribbean (except Hawaii) and Europe, Africa, the Middle East, Asia, and the Southwest Pacific.
Routes between the Middle East and Europe, Africa, Asia, the Southwest Pacific Ocean.
Routes between Japan, Pakistan, Singapore, Kazakhstan, the Southwest Pacific Ocean and Europe, Africa, Asia (except Japan, Pakistan, Singapore, Kazakhstan).
Infant passengers in any booking class may check in one item of baggage for free, weighing up to 23 kg (50 lb), plus one folding baby cot, stroller or cradle (for infant passengers only).
PhoenixMiles Lifetime Platinum, Platinum, Gold and Silver members when travelling in First or Business Class may check in one additional item of baggage for free, weighing up to 32 kg (70 lb); when travelling in Economy Class may check in one additional item of baggage for free, weighing up to 23 kg (50 lb).
Star Alliance Gold members may check in one additional piece of baggage for free, weighing up to 23 kg (50 lb).