This might be a silly question but I just picked up my first pair of Goggles with interchangeable lenses, the Smith I/O. I'd like to carry a spare lens with me for those variable light days that sometimes start out with flat light and end up sunny later in the day or vice-versa. For now I'm just throwing the spare lens in a pocket on my pants but am a little worried about potentially damaging the lens (or my leg) if I were to fall on it the wrong way. I'd imagine it takes quite a bit of force to break a goggle lens but the thought still crossed my mind. I suppose scratches are more likely but I am using the microfiber bag at least.
I think it would be cool if someone out there make a curved hard case just for spare lenses, not for the goggles themselves. That would make me feel a little better with some added protection for the lens. Does such a thing exist? I haven't been able to find anything by searching here or online.