If you consider a Bic includes tinder, it's not much room at all. A size comparison to a tiny ferro rod by itself is not an accurate comparison because the ferro rod still needs a scraper and tinder to get a flame going. Once you add the extra stuff, you're well over the size of a mini Bic. A size comparison to matches is fair, but one match is good for one flame, while a mini Bic is good for 100+ flames. A mini Bic is about the volume of 10 good matches.