"Airtight" Containers.

Why can't I buy an airtight kitchen container? Hardly any actually claim to be airtight any more, and even those who do fail this test:

1. click the lid firmly onto the container
   
2. hold up to ear and gently squeeze sides or lid
3. hear the faint hiss of air running in and out of your "airtight" container

All "airtight" kitchen containers suck.