Dr. E.G. Ervin was a very clever man. Any perusal of his writings will confirm that. This little 'weapon' of his was part of a small article detailing a few different ideas. It was not clearly explained and I had to re-read many times to grasp what he was saying.

If you apply this idea to your egg bag, you will have at your fingertips a technique few others know, and knowledge... is power.