The state of being used up; something designed to be used once until it's finished (single-use/disposable).
その化粧品は使い切りサイズで旅行に便利だ。
That cosmetic comes in single-use sizes and is convenient for travel.
使い切りのボトルは衛生的だが、ゴミが増えやすい。
Single-use bottles are hygienic but tend to increase waste.
薬は最初から一回分の使い切りパックになっている。
The medicine comes in single-dose packs meant to be used up at once.