Carry-on Baggage - China Eastern Airlines

What the official page says

Domestic flights Economy / Premium Economy: 1 piece; International or regional flight Economy / Premium Economy: 1 piece. Size of carry-on baggage: A (length) <= 55 cm, B (width) <= 40 cm, C (height) <= 20 cm. In addition to the designated carry-on baggage, each passenger is also allowed to carry one free carry-on item that can be placed under the front seat (reference dimensions of the space under the seat: 35 x 32 x 18 cm), such as a handbag, briefcase, laptop bag, camera bag, or other similar sized or smaller items.