Mantles on the lantern will last for decades as long as they're not broken or an insect big enough to damage them gets inside the globe (*before it gets cooked). I've had very good luck with the older, vintage Coleman Silk-Lite brand for brightness, and a good price is anywhere around $4/ea, shipped. The new stock Coleman 21A mantles - I prefer tie-on vs. metal clips - are thinner, maybe more durable due to having less mass and a bit of shock resistance, but not as bright.
Stock up now, the vintage ones are getting harder to find, and shohld be considered consumables if you travel with your lantern. Try putting it on top of a heavy jacket or blanket for better bounce vs. shock when on the trail, too.
Stock up now, the vintage ones are getting harder to find, and shohld be considered consumables if you travel with your lantern. Try putting it on top of a heavy jacket or blanket for better bounce vs. shock when on the trail, too.