I've been in need for a new device to carry things on my person, more specifically while riding a bicycle. I've always used backpacks and have never owned a messenger bag. Besides helping me amass multiple cool points amongst my hipster brethren, what makes a messenger bag better than a backpack? Having never ridden with one I'm curious about why so many people use them, and I hope there are more justifiable reasons than "thats what real messengers use, brah"...