Sometime try boiling water on a fire in an aluminum foil cup and let me know how it goes. The foil always has leaked badly when I've tried it. This kit also looks much bulkier (heavier?) than a similar metal or fabric pack. I carry much (or most) of that stuff anyway in my pockets, and what I need or want is a small easy-to-carry pack (butt or otherwise) for some food and water.