I carry wax dipped strike anywhere matches in a matchsafe as my primary unit. Matches are the most familiar firesource. If I am disabled the ability of a novice to create a fire is paramount. I also carry a large metal match in my pocket, SPARKLITE with dedicated tinder in my PSK and a good supply of Lifeboat Matches. My many spare secondary knives stashed among my various gear are high carbon, high rockwell Moras. This specification allows sparking with carried or natural flints. Tinder consists of sparklite tabs and small sticks of Fatwood.