I bought this for airline travel.  To simplify my going through the security line with my personal items, phone, wallet, keys, ipod touch, and plane tickets. Tickets get a little bent but not a big deal to me.

I find I can fit all of that in the pockets available and simply remove and place it on the security belt when it is my turn, don't have to go digging in my backpack before or after security to secure or put my stuff back in my pockets. I just pick up the Bandolier and throw it over my shoulder.

I am 6' and 200 lbs and it adjusts yo fit me comfortably.  It is great for air, car or urban to light rural travel.

BTW I would not consider using this as a go to pack for long or challenging hiking in the mountains as it does not seem robust enough for the elements.  If worn under a coat it would be good to go, but would not want to expose to rain or snow for very long.