Sure. The basic answer is that I use a good running backpack and it's easy for me to carry all that stuff. When I first started, I was sparring (boxing) in the morning before work, so I used a eagle creek overnight hiking pack. it was bulky but not too bad for a 3 mile run.

Once I stopped sparring in the morning, I switched to a Black Diamond Dart. Easy to run with, and ample room for all the stuff you mentioned.

I now use a super light pack, and only pack my lunch, pants/shirt/socks/underwear. I live in SF, and generally don't shower unless I get really sweaty. Some people find this gross in theory but I don't, people in NYC get sweaty as hell walking from the subway to work in the summer in their regular clothes, so I've never really seen the difference.

Two big things I do come to mind: I never take my laptop to/from work everyday. I also keep dress shoes at work under my desk.