Airtight implies the highest level of sealing, not allowing any air passage. We use airtight jars to preserve jams for a long time.
Pro Tip 2/3
Protection Importance
When 'airtight' is used, it usually stresses the importance of protecting contents from air or moisture. These documents are in an airtight safe to prevent damage.
Pro Tip 3/3
Preservation
'Airtight' suggests long-term storage or preservation in various contexts. Coffee beans are kept in airtight packaging to maintain freshness.