noun
glass jar
A jar made of glass, typically used for storage or decoration.
祖母はガラス壺にクッキーを入れている。
My grandmother keeps cookies in a glass jar.
瓶 is a general term for bottle or jar, not necessarily made of glass. ガラス壺 specifically emphasizes the glass material.
Compound of ガラス (glass, from Dutch 'glas') and 壺 (jar, pot).