| 摘要 |
<p>A packaging system for roast and ground coffee is disclosed. The packaging system can comprise a container (11), an overcap (30), and a visual indicator (40). The visual indicator can indicate a pressure difference between the inside of the packaging system and the outside of the packaging system by moving from a concave outwardly position to a concave inwardly position. The visual indicator (40) can comprise a bubble.</p> |
