Doug's kit, with modifications, mostly for water procurement and purification. I have played with many, and these components works, are durable, it is small enough to carry with you all of the time (unless you are in a Speedo in a fragrance commercial) and it has what you need. the only thing it lacks is water procurement and purification. For that I like Aqua pouch plus . It is small enough and has a water container, strainer and purification tablets.