refillable
Adjective: Capable of being filled again; designed to be used multiple times by adding more of its contents.
- (The bottle can be filled with water again after it is empty.)
- (The cartridge can be filled with new ink rather than being thrown away.)
- (Cups that can be used repeatedly by being filled with coffee again.)
"Refillable container": a container specifically designed to be filled again with the same product (e.g., a soap dispenser or a gas canister).
- The hotel provides refillable shampoo bottles in the bathroom. (The bottles are meant to be refilled with shampoo, not discarded after one use.)
"Refillable prescription": a medical prescription that allows a patient to obtain more of the same medication without a new doctor's visit.
- This is a refillable prescription for your allergy medicine. (You can get more of the medicine by requesting a refill.)
Refill (noun): an additional amount of a substance used to fill something again.
- I need a refill for my pen. (A new supply of ink to put inside the pen.)
Refill (verb): to fill something again.
- Please refill the water jug. (Fill it once more after it has been emptied.)
Refillable (adj): as defined above.
Reusable: able to be used again, especially after cleaning or refilling.
- A reusable shopping bag is better for the environment. (It can be used many times.)
Rechargeable: able to be charged again with electricity (for batteries or electronic devices).
- This is a rechargeable battery. (It can be recharged, not thrown away.)
Renewable: able to be replenished or made new again (often used for resources).
- Solar energy is a renewable source of power. (It can be used again and again.)
There are no common idioms using "refillable" directly. However, the concept appears in the phrase "fill 'er up" (an informal request to fill a vehicle's fuel tank completely), which implies a refillable container.