Just be careful if storing your FW or any machine in humid areas. Fabric totes/ cases and cotton thread can absorb moisture, causing rust and mold. The horsehide glue used in making the cases molds easily and is a common cause of odors, as is the drip pan felt. Perhaps someone dealing with these issues will chime in, but I think using silica gel packs might help, and some sort of waterproofing or sealer for the case? A friend stores her FW in a train/cosmetic case with packs of floral dessicant crystals which are used to dry and preserve flowers.