For each piece of luggage greater than 158 cm (62 inches) and less than or equal to 203 cm (80 inches including pulleys and handles), an additional overage baggage fee will be charged. ?
The weight of each piece of luggage in luxury first class, first class, and business class must be greater than or equal to 2 kilograms (4 pounds) and less than or equal to 32 kilograms (70 pounds). The weight of each piece of luggage in Premium Economy Class, Premium Economy Class, and Economy Class must be greater than or equal to 2 kilograms (4 pounds) and less than or equal to 23 kilograms (50 pounds). ?
If the weight of each piece of luggage is greater than 23 kilograms (50 pounds) and less than or equal to 32 kilograms (70 pounds), additional excess baggage fees must be paid. General checked baggage exceeding 32 kilograms (70 pounds) for passengers in all classes must be divided into two pieces of checked baggage. ?
Extended information:
Dry ice, liquid drinks, liquid cosmetics and daily necessities
Can be checked in or carried into the cabin as carry-on luggage. Dry ice should be refrigerated at low temperatures and the total weight of dry ice carried by each passenger should not exceed 2.5 kilograms (5 pounds). According to CAAC regulations, each passenger is not allowed to carry more than two bottles (with a volume of each bottle not exceeding 500 ml) of carbonated drinks, mineral water, tea, milk, yogurt, juice, etc.
Passengers can purchase drinks after passing through airport security or subject to restrictions. Passengers are not allowed to bring other alcoholic beverages except those purchased at the airport after security check. Each passenger can carry two bottles of alcoholic beverages under 1kg, with the total volume not exceeding 1000ml.
Air China - General Rules for Checked Baggage
Air China Official Website - Special Baggage