Originally Posted by
tyrion
Some have a 2nd strap with which you can clamp it tightly to your back.
[IMG]http://cloud.timbuk2.com/static/Product_Images/MBCRS02-Cross_Strap_With_Clips/2010fall/465/MBCRS02_model1.jpg[/I MG]
Bike messengers were using these bags long before hipsters culturally appropriated them.
...And getting scoliosis out of strutting around the college campus with them.