something to think about survival wise is that you will most likely not be trying to survive in a well used camp ground or near a trash dump but in some sort of "outback" where the animals are not used to people and will run or stay away from your shelter. my buddys at bwca.com are pitching tents in places where a fishing party may have been camped for several days,leaving fish bits and grease around the fire place.which is why i "go deep" into back country lakes..but if your in a real survival deal your problem is not people around attracting bears but no people around to save you.