[Trick birthday candles are what I keep in my pack.
The kind that when you blow them out, they instantly relight.
I wish those came in larger sizes.
Here's another good one. These can be found at Walmart along with Presto Logs, etc. They're very light weight and will burn hot for 15 min. Just light the wrapper. They won't light with a striker, though. You need a match or lighter.