Where are you finding these soup cans? The ones I see these days all have petroleum chemical-based liners and seem sealers that would likely become toxic when placed over the camp fire. I actually keep a soup can in each of my larger kits simply because I figure that if I really need it then I'll take my chances with the toxins but I would certainly rather not have to risk it if I don't need to and I never use them voluntarily when camping for that exact reason. <img src="/images/graemlins/smile.gif" alt="" />