Is it okay to take disposable plastic cups to Thailand?

Yes, you can. Plastic, empty cups can also be placed in the password box and boarded directly. However, water can't be put in a cup before entering the customs. You can only fill it in the waiting room after customs. At present, the aviation law stipulates that liquids exceeding 100cc cannot go out of customs.

Tea drinks: Tea drinks can't be carried on the plane, and all the liquid in the cup must be poured out when entering the security check. Of course, a small amount of wine can't be taken on the plane, but can only be checked. In addition, cosmetics requirements: it is recommended that cosmetics with a capacity greater than 100ml be checked in the luggage.