Im looking into buying a new pack of some sort to carry my survival gear when im deep woods hiking. I was wondering if anybody had some imput as to the pros and cons of different types of packs....namely the differences between full back packs (the hiker's types) and just a shoulder type bag (i.e Medics bag). Ive also looked as several types of "alice" bags at army navy surplus stores. While for the most part i plan to travel as light as possible with only minimal gear, i think it might be more wise to get a larger pack that could accomodate more gear should i ever decide to bring it along. What do you guys think?