Like what? Lighters? They have moving parts & can break. They're pressurized and can also be affected by altitude. They can also explode in too high temps, or not work if it's too cold and the butane turns to liquid rather than gas. Ever dunk a lighter in water and try to light it? Flint and/or mag bars work when wet, aren't affected by wind, temperature, altitude, have no moving parts, & work even if dropped or broken. That's why... <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />