Ok, bearing in mind that I live in an urban enviroment ( mostly) and our law enforcement agency's sometimes seem to think that the Law is whatever they say it is, ( In theory I can, on the provision that it is not of a proscribed type like a butterfly knife, flick or gravity knife, have about my person an knife that has a 3" edge or less without having to explain it. Fixed blade knives or folding knives of above that size require reasonable excuse. In practice, the Police may try to prosecute for possession of an offencive weapon. Thus circumventing my exercise of a right) I normally carry a Leatherman Wave, One of two Benchmade folders and a torch, lighter and money, cell phone, credit cards etc on my person. I carry waterproofs, food & water as needed and a small first aid kit plus anything else I deem needed in my rucksack. Common sense ( Now there is a contradiction in terms for you) really .