szczelny v angličtině:

Keep food in airtight tins.

If your windows are not airtight, moisture will seep in.

These containers are airtight.

Preserves must be stored in a jar with an airtight seal.

Tom doesn't exactly have an airtight alibi.

Store the cake in an airtight container.

Hey! How are you? We're keeping your girlfriend completely airtight.

Biscuits will stay crisp if you keep them in an airtight container.

Biscuits will stay crisp if you store them in an airtight container.

Store the food in an airtight container

The tip of the piston has a small indentation or hole, and just behind the tip is usually a gasket of some kind to ensure an airtight seal—perhaps a rubber O-ring or simply some waxed string.

This food will keep for a week in an airtight container.