As everyone is saying, it all depends. I work every day in an urban area, so I carry a folder in my pocket that's big enough for most chores, but not so bulky that it attracts comment (Spyderco Salt II). On weekends it's usually a little bit bigger, stouter folder (Camillus Heat). For camping and hiking, I usually prefer a small-to-medium fixed blade, like the Becker Necker (now out of production).