What is the absolute deepest concealment I can use?

I need some form of gun/holster combo or even a strapped knife to be able to carry at work (office job). The hard part is that I utilize the gym, and change out of my pants. I think I have two options:something I can strap to my leg under my underwear -something I can leave in my pants pockets I change out of (I am able to lock them in a locker)I am also massively against off body carry, but carry a backpack every day if that is a better option (can also lock up at the gym and at my desk)Thank you! via /r/CCW https://ift.tt/2NxFR6c