Originally Posted by
FrankJ
Adding another strap...I don't see how this is any different/easier/etc. than a backpack.
The hipster comment was just a joke.

Hipsters are fair game for joking.
The difference between a messenger bag and a backpack is that with a messenger bag you can loosen the straps and swing it around and access it in a second. If you don't have to access it easily the backpack is better.