Probably also 10, if you go to the plane, remember not to overweight and oversize
According to the relevant provisions of civil aviation, items that aircraft passengers can carry with them are:
Unchecked baggage should be able to be placed under the passenger's front seat or enclosed luggage rack.
1. The weight of free carry-on items is limited to 10 kilograms per first class and business class passengers and 5 kilograms per economy class passenger.
40l backpack can hold much clothes
2. Passengers holding first-class and business class tickets may each carry two items with them; passengers holding economy class tickets may only carry one item with them. The length, width and height of each carry-on item shall not exceed 55CM, 40CM and 20CM, respectively, and the total weight shall not exceed 5 kg.