Pocket knives every day, everywhere, coming out of your ears. Weirded me the hell out the first time I got in trouble for having a small, helpful little tool in my pocket. I was taught how to safely handle one when I was 8, and have always had one in my pocket since I was 14.
Like... of course I have a pocket knife. I have a spare in my backpack to give away, I have a collection at home, and I have favorite styles and designs. They're great gifts, they're always useful, fit in your pocket, and weigh nearly nothing. Why don't you?