Boy.... I guess my question was a little vague. I guess I want a bag that I could keep at the house that if I had to leave home quickly and was pretty sure I could never return to my home I would have at least a few basic necessities. I have a small bag that goes elk hunting with me that has things like a first aid/medical kit, a few knives, a multi-tool, some paracord, fire making supplies, a compass, and some other "survival" gear. I guess what I am looking for is a larger bag that would hold all of this plus mags and ammunition for a rifle and a handgun. I don't need to pack food or water as these items just add necessary weight (well, maybe a couple of bottles of water just in case). I guess a backpack makes more sense than a duffle bag because eventually I would probably end up on foot.

Thank you all for the replies.