Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I've always had good luck with wadded up newsprint, but then I do live in the high desert. I suspect that if you could use an acid free tissue as the inner layer, followed by enough newsprint to offer cushion, you'd probably be okay.

As a caveat, I really don't know what extended periods of high humidity, during long term storage, might do to the process I just described.

I should be good on humidity, I keep a humidifier going in the winter and a de-humidifier all summer