Reusable means made to be used many times over. A reusable cup, reusable bags, reusable packaging.
It only helps if it is actually reused enough times to pay back the extra material in making it, which for a cotton bag runs to dozens of uses and for some cups to hundreds. That break-even point is the whole question and is often left out.
1adjectivereusableMade to be used many times over.
“Bring a reusable bottle so you don't have to buy plastic ones.”
reusable is a quality.
From reuse + -able.
Etymology from Wiktionary, CC BY-SA