storage container; preservation container
A container designed to keep food or other items fresh, often airtight or with a tight seal. Common in kitchen and household contexts.
Please put the leftover food in a storage container and keep it in the refrigerator.
This preservation container has a high seal, so you can safely carry soups and stews.
A common colloquial term for plastic food storage containers, often from the brand Tupperware. 保存容器 is a more general and formal term.
Specifically emphasizes an airtight seal. 保存容器 focuses on the purpose of preservation, while 密閉容器 highlights the sealing mechanism.
Compound of 保存 (preservation, storage) and 容器 (container).