Should I buy a ferro rod or a lighter for emergencies?

A ferro rod is more reliable than a lighter in cold, wet, or high-altitude conditions because it has no fuel to evaporate and works when soaked. Many buyers carry both: a lighter for everyday convenience and a ferro rod plus waterproof tinder as a backup that won't fail when it matters most. All-in-one kits that pair a rod with tinder are popular choices for survival bags.