How many pieces of carry-on luggage can I take on an international flight?

You can take your notebook and bag, but pay attention to which airline it belongs to. You can go to Singapore by Tigerair Singapore, right? That's a low-cost airline, and the weight is only 7 kilograms per person for free. The weight of the notebook is already quite large, so the size of your bag is very important. If it is a bag (backpack), it is not a big problem. If it is a box, they will let you check it. Except for low-cost airlines, other airlines have no special regulations, just follow the rules of normal international flights.