Camera Bag Makers: Tripods Do Not Belong on the Side of Our Camera Bags

What's the point of a backpack as a camera bag? I want to hone in one these before I defend my idea as a photographer who tests arguably the most camera bags on the web. The purpose of a backpack as a camera bag is the same as you'd choose one in every day life: your back. Messenger bags and slings tend to throw off your back if they're too heavy and as a professional photographer, you're otherwise going to be carrying them with you everywhere. The smaller ones are fine, but if you need to carry...