Has anyone used one of the fabric type flight cases/kits? If so, how well do they hold up compared to the vinyl/leather ones? Fit in an ERJ okay? There's something about the boxy vinyl/leather cases I don't like, but I'm not sure what it is. People were bashing backpacks in another thread, is the fabric case considered to be too much like a backpack or student flight bag? I haven't noticed anyone admit to using one here.