I did exactly what you are talking about with the eggcrate but was still paranoid about small pieces making it through (more so because my top off is there also and don't want that to get tangled and stuck open). I ended up using eggcrate and on the one side I also used some sheets of needle point plastic stuff (not sure what it's really called) from Wal-Mart and glued it to one side of the eggcrate. So far this has worked out great and the whole package of the plastic from the craft section was just a few extra bucks.