I find the round tin, to be more water tight. That about the only difference... I was making lite of it.....I prefer water tight, and if the Altoid tin was I would prefer it for size. Both will fit a shirt pocket...... I have both, but do not store fire making in the Altoids... Like I said I don't keep and use the main stream items used here. But then I don't fly. I am curiouse as to how "Flints" glued to a tin can be used, as what do you do with them? Mac<br>