This is simple! Do you carry a magnifying glass with you into the wilderness? :-) I actually do. I think the magnifyer is an overlooked and underrated item and as long as there's sun, there's fire!
I have a small one, which is 4 centimeters in diameter. It's made in plastic and I've sawed the 'handle' off. Then it's 'coated' with normal tape, so it can take a scratch. :wink: Instead of this you could also carry it in a little soft pouch. :biggthump