Very true! I do the same thing myself, since I prefer the sapphire crystal for durability (solar is not available on that one). I can see how it would be very u

Very true! I do the same thing myself, since I prefer the sapphire crystal for durability (solar is not available on that one). I can see how it would be very useful for someone who's on an ultralight type of thing where they may not even have a cell phone.