Yeah, Andy, rubber bands would sure work. I just used the floss because that's what I had on hand when the urge to tinker struck. I had never really paid any attention to fatwood til then & I was really surprised when I cut it into short sections using the saw in my Leatherman Wave.
WOW, they aren't kidding when they saw it's filled with resin. So much so, in fact, that it doesn't even produce regular sawdust like other woods when cut. Just a thick, gummy paste that clogs the saw teeth. Not a problem, but it sure demonstrates why it burns so well.
I think that the next time I make up a batch of these firestarters, I'll slide 2-3 of the big strike anywhere matches in each end before I vacuum seal them.