A stash jar is a container used to store and conceal small items, typically associated with storing herbs, spices, or other substances. The term "stash" often implies hiding or keeping something in a discreet manner. In various contexts, stash jars are commonly used for storing marijuana or other herbs, keeping them fresh and protecting them from light and air.

Stash jars come in different sizes, shapes, and materials, ranging from simple glass jars to more elaborate designs with airtight seals to maintain freshness. Some stash jars are also designed to be odor-proof, reducing the likelihood of any distinctive scents escaping and attracting attention. Overall, the primary purpose of a stash jar is to provide a secure and discreet means of storing and transporting small items.