It does not seal airtight and if you turn it upside down while using it with 2-stroke engine oil to mix, it loses fuel. I would say it is mediocre, I have a much better Stihl.

Good material. Quite sturdy. However, it does not seal the lid tightly, resulting in a gasoline smell and a slight fuel loss. I solved this problem by closing the lid together with a piece of plastic bag, thus securing it and preventing any liquid leakage.