Bah... I just toss mine in either a box in the closet or my desk drawer. They seem to do just fine. The only caveat is if I use it and it gets dirty. Then it's just a rinse under the kitchen sink, dry with a towel, then air dry for the rest of the day. No problems yet. Sometimes run a Q-tip down the middle and get some pocket lint out.

Probably had over 2 dozen folders, and only had one get any hint of rust: an ATS-34 (I think) Emerson CQC-6. I was NOT pleased with that knife.