Thanks for all the replies on this. The pack I'm having the biggest problem with is an early 90's DD Bombpack. Sucks because it's in pretty good shape other than being sticky and having an odor. It was in a large Rubbermaid box in an attic for a few years with a lot of other gear, but no moisture. Maybe the heat and lack of breathability in the box contributed. At any rate, I'll give the talc a shot. Thanks again!