I based my first post on something that Kostya said in the lecture you recommended (thanks again by the way). If you're going to restaurants just to practice and get experience then you could be hurting the business of working professionals in the area. I grouped that in my mind with bars at the time.Have you listened to businessmen like Kostya Kimlat? I am also a businessman and there are plenty of things to go around. You make the pie bigger. You can't steal gigs.
That being said, it probably does no damage at all to the business of professionals if you're just doing a few routines at the local watering hole for the couple hours you're there.
Back to pocket management @GrahamHorgan
For duplicates or gimmicked cards, you can most likely get away with just keeping them in your deck. You can always just leave them in the box when you take the rest of the cards out and bring them in later when you need them.
For my pockets:
I always carry a packet trick in my wallet, in an envelope. There's other stuff for tricks in my wallet ready to go as well. That is in my left pocket along with a regular sharpie, a frixion pen, and SMOKE 2.0 oriented differently so that that's the one I'm grabbing. In my right pocket, I carry my phone and another pen (my everyday pen) and Spidey's The Name Game in an envelope. In the coin pocket, I keep...wait for it...coins (omg groundbreaking!)! I also keep a book of matches tucked in there as well. My deck of cards is clipped and tucked into another pocket.
Basically, everything I carry is small and light and doesn't take up much room at all.