also: マイはし
noun
personal chopsticks; reusable chopsticks carried from home
Refers to chopsticks one brings personally, often in a case, to avoid disposable ones. Common in eco-conscious contexts.
最近、マイ箸を持ち歩く人が増えている。
Recently, more people are carrying their own chopsticks.
ランチのときはいつもマイ箸を使っている。
I always use my own chopsticks at lunch.