Office bag/brief options (for Anglo-Saxon people)

Hey everyone,

I'm trying to decide between a backpack or a briefcase for my investment banking job. I know a backpack with a suit can look a bit odd, but I'm wondering what everyone else thinks. In the country I’m in, more people seem to get backpacks.

Additionally, how do you all handle carrying gym clothes to the office? Do you bring them in your bag, or do you have a separate gym bag?

And finally, are North Face backpacks (think Borealis for example) generally considered acceptable in banking? I'm curious to know if there are any specific brands or styles that are more preferred.