Using a Tamrac adventure 9 for more action scenario~
1) Backpack good for times where you are hiking.
2) Weight~ Back pack can share weight on both shoulders
3) Quite Stylo~ I bought the camoflage one.
4) can fit a laptop.
Using a Crumpler 7 million (red) for everyday scenarios~
1) Don't look like camera bag (good for travels)
2) Can carry alot of gear~ i have a 580exII, 70-200, 17-40, 30mm, Hoods, Blowers and etc~
3) Red! Easy to locate my bag~
For your reference~