Different airlines may have different regulations, but the regulations of China Eastern Airlines are as follows:

Free to carry 1 piece, with the length, width and height not exceeding 56x36x23cm and the weight not exceeding 5kg.

check luggage

You can check 2 pieces for free, and the sum of the length, width and height of each piece can't exceed 158cm, and the weight of each piece can't exceed 23kg (see the red circle below):

You can refer to it