I use a soligor too. I like the way that it snaps tightly shut after you let go of the door. I don't think that I've ever fogged the contents. I tend to try to put in just what I'll need for a session, just in case of accidental opening, but I don't think twice about leaving the remaining in there all of the time.

I hated those professional metal ones with the 'rolltop desk' type door. Sometimes they closed all the way... sometimes not. A real paper waster.