I pack sometimes, usually when I'm going out to somewhere gay in case I get groped lol, or if I'm wearing certain jeans that hang better when I'm hung too, so to speak! I don't pack when I'm at work cos I work with kids and I don't want to look like I've got a hard-on around them!
I use a packer from gear guy that was an STP, but I took the tube out cos I couldn't really get the hang of it. It's quite comfy but rather on the big size for me, as I'm only 5'3". Plus it tends to make me get too hot, and the material makes me itch, unfortunately. I either wear it with tight underwear or in a jockstrap in boxers.