I would recomend using an altoids tin for holding the survival items. As far as the actual items, I think Codger_64 gave the best advise. The great thing about the altoids tin, is you can make multiple kits (for your daypak, camppak, and car).
Also, a survival kit not many think of is for the car. For some time now I've been driving around with a pre-made '3day pak' in my car, so, if I ever break down somewhere far from civilization, I will be alright for at least 3 days (and probably a lot longer). This has items such as a hooded sweatshirt and outdoor pants, hat and gloves, rice, water and water purification tablets, small cookin utensils, lighter, newspaper (small amount), protection, poncho, a extendable fishing pole, line, hooks, first aid gear, rubbing alcohol, etc, etc a (and much more - and it doesn't weigh much either)...