Backpacks would seldom last me a full year until I bought a Goruck GR1 backpack about 7 years ago.

It has a military influence in looks, but I've never had any comments or dirty looks in any conference/board room I've had it in. It's the best laptop bag I've ever owned. Durable, comfortable and versatile enough for non tech adventures. I've lived out of it for a week at a time when traveling.