I too have a hard time connecting my brain to a toolbag equals a backpack. Nothing wrong with the concept and a few of the lads at work swear by them. They like the Klein model. The one for about 79 dollars at Home Desperate. There is a larger and higher priced model but they seem to like the smaller one.
The Veto gets rave reviews but I am really ambivalent about it. I have handled one in person at a vendor store and frankly, was less than enthused about it. Don't get me wrong. Construction was superb. Heavy duty stitching and zippers etc. What I did not like was the pocket layout. Not nearly enough tall/slim pockets for electricians tools like drivers and pliers. And it is heavy even empty. Let lone if you actually load it up with a lot of heavier hand tools like ratchets, sockets, spanners, and pipe wrenches.
I think the weight issue is one reason why I have not tried them. I am always afraid the things are going to be so laden with hand tools it will be a back breaker to carry around. Best of luck and lets us know what you settle on.