Before you think hockey bag? Well believe it or not ive seen a few people lug around huge hockey bags as work bags. Always gets me thinking what the hell they need such a big bag for. If its not a hockey bag they got, then its a camping bag. Ive always used shoulder bags cause even though backpacks are much more comfortable (especially with more weight), often when I wear my shoulder bag, it feel like a giant mans purse. I just wear it on my shoulder and not around my neck and under my arm cause thats a bit too feminine for me. I like backpacks but they dont look professional like shoulder bags. Like you cant wear a leather jacket with a backpack, that would look stupid.
Sling packs I could never use one, too gay for me. Tried one on and I was immediately embarassed. Felt like a mans purse.
Don't have to carry any papers or anything, maybe just a small folder with important stuff... So I just have the backpack below. Has a compartment in the back where I can slide my laptop into, and extra room for my iPad and chargers.
Then the big compartment in the front I can put my gym clothes and some shoes. Smallers compartments towards the front I can stash multiple bags of tea, and a tea steeper. Throw a can of seltzer water on the side and I'm good to go. Oh, and the lunch I take I just throw with the gym clothes.