I work on the line also. I generally carry an 18500 device with a kayfun lite attached--enough battery and juice to get me through a shift. I do however carry a small ego case packed with a few essentials--wick, wire, drill bit, tweezers, multitool, screwdriver, etc. And then lately I have been carrying a 14500 type device because it fits perfectly into the pen/thermometer pocket on my chef coat. When I carry the 14500 device I always have multiple batteries and a small bottle of juice though. When I carry the larger mod into work I leave everything else in the car--but I've gotten away from that because having a 18xxx mod in my pocket weighs my chef pants down too much, and I don't like it sitting out on my station as it gets greasy.