Here’s how. It’s called OneBag, found via Unclutterer. I grew up as a Boy Scout, and while “Be Prepared” is a great motto, it does lend itself to taking too much stuff everywhere you go. At this point, I would argue that manliness is completely unrelated to the stuff you have with you (except perhaps a knife), and dependent on the physical readiness and skills you posses which will allow you to deal with whatever situations you encounter.