i always have my backpack with me, with the things that i deem necessary to have available to me. among whatever book or magazines i am reading, my sketchbook, travel paints, brushes and other asssorted good there are always at least two pipes, a pouch of tobacco, and usually a tin of another, and two nail tampers in case i forget to grab my favorite one. i never hesitate to smoke in public, and i have rarely ever heard comments. maybe being 6'2" 220 and tattoos taking about 45% of my flesh helps. i grew up the weird kid, and became a slightly strange eccentric adule. i have always done my own thing, so i don't notice if anyone else notices i am smoking a pipe. i just do what i do.
i did have a cop in downtown cincinnati ask me outright: "hey, do you have weed in there." i took a big old draw and said: "no sir. i use glass for that..." and kept on walking.
do your thing man.