If you cary the standard Mil-Spec canteen or it's NATO equivelent, they make sense. The stove nests with the cup on the canteen inside the carrier. Normal fuel if carried is either Trioxane or Hexamine tabs or whatever natural fuel may be gathered.I personally went with the Esbit pocket stove from Germany.The supplied fuel bars will not breakdown when exposed to air and it fits in my pocket.Either unit will requrie a little care in setting up. They aren't the most stable units.<br><br>