I agree with Hikermor in that I find the emergency, weather proof matches, to be very reliable and the easiest way start a fire under difficult conditions. I always carry them. There are multiple packaging options to fit different packing methods.

I have found that the Sparkie does have issues with the release button, and that is why I EDC the Blastmatch instead. It is larger and heavier, but I have never had an issue with it. I am still carrying my first one that I have EDC'd for over 3 years.

My Bic lighters I just replace occasionally as they will lose their fuel over time just from being in the pocket. I also have a replacement or two in each bag I carry.

I have not had any problems with my Fresnel lens either, though I do keep it in a protective sleeve.