so, in my cheapness, and recyclingness, it is safe to cook in a soup can, right?, ive noticed some are aluminum, others like fruit cans look like a composite of metals on the inside. the soup can fits perfect on my new pocket rocket and i really want easy coffee in the morning after a solo camp and backpack. (which ive only done once, 7 miles in, 5 out, a couple months ago, loved it)