Backpacks at work

OK, I have a problem with a trend I'm seeing at the office -- that of grown, professional men bringing their stuff (laptop, files, etc.) to work in a backpack, as if they're a college student. I often see these men wearing both straps and walking from the parking lot to their office very quickly, faster than normal people walk. The pack is often one with daisy chain loops and other features that come in handy when hiking in the backcountry.

I'm sorry, but if you wear a backpack to work at a professional, engineering-type job, you're a dork! Just because it's leather like the guy in the photo below doesn't make it ok.

Side note: Woman in photo is telling dork wearing backpack, "Oh, is this your first day on the new job out of college? Your mommy must be very proud!"

Unless you actually have to walk several miles to your desk, a man should have a briefcase, worn on ONE shoulder only. Thank you. That is all.