I was cleaning my Jazz Bass when I noticed it looked dark around parts of the corner of the headstock. What in the world did that? Then I realized it---gig bag. Mine is a nice one, I think (Fender, thickly padded), but maybe the liner should be made of something different. Dang, it's my first gig bag, and quite frankly, I've been enjoying the freedom it affords. I don't worry about other damage since I'm extremely careful about not bumping it around. It surely does help me load in and out, especially when my calendar gets busy. I love to wear it on my shoulders so I can load in in one trip. But, alas, maybe I'll have to rethink. Apparently it's all the movement inside the bag that is wearing on my finish. Anyone else have a similar problem, or a solution?