Can I bring a 300ml vacuum flask on the plane?

If the thermos cup is empty, it can be carried on the plane

Empty glasses can be carried with you, if there is liquid, you need to pour it out when you go through the security check. After the security check, you can fill the cup with water before boarding the plane. There are direct drinking water and boiled water in the waiting hall of the airport, and most flights provide free drinks and mineral water. <br/>If it helps, please click to accept. Thank you 🙏

When going through the security check, drinks and water have to be poured out. When you enter the departure hall, you can get hot water. It’s no problem to take it with you. Hope to adopt it

Thermos cups can be brought, but liquids are generally required to be poured out.

Hello, empty cups can be brought on the plane. If there is water or drinks in the cup, the security check will ask you to pour it out.