Before I discovered the "cock sock"...I only wore tighty whities. But my drag dad introduced me to the cock sock, and gave me a packer. I'm not sure which model it is though. It's a 5 inch. But you take a sock, hold the packer up to the sock. Hold it so the balls are at the end of the toe, and mark where the shaft of the packer sits. Now cut a hole right there, not too large, remember that socks are stretchy. Just put the packer in there, and poke the shaft of your packer out through the hole you cut. From there you can buy velcro strips and glue velcro to your underwear and to the cock sock, or just safety pin it to your underwear. It's by far the greatest thing I've discovered, it made it so I can wear boxers and boxer briefs and do freakin cartwheels without worrying about my packer falling out of place.
Oh yeah, I do use the opening in the underwear. It's too much work to try to pull the top of the underwear down, shove my stp in place, and piss. I just push my packer aside (since it stays attached to my underwear, much easier to do now) and use the fly opening.
