... Why do you need to ask us which bag to purchase.
Perhaps he asked because there's folks here who have been shooting for years and who have tried different bags?
Lets see...
Black cube shoulder
Green Eagle Creek shoulder*
Dark Green 'Travelsmith' shoulder (w/waist strap)*
Tamrac 610
Tamrac Camera/Laptop backpack
Lowepro Street & Field belt system
Kinesis SLR bag w/shoulder strap
Kinesis belt system
* = probably wasn't sold as a camera bag?
...I think I've tried a few, although as one can see from the above, I've generally preferred a "shoulder" bag, although I've gone to one that has a waist strap. I might consider one of the newer sling bags, but I'm not sure how compatible they would be while carrying a large daypack / small backpack.
Similarly, I've also found that what I like to carry around to shoot is not the same kind of bag that I like to carry through airports. Carrying a laptop also is a contributing factor.
Finally, having all of your lenses in one bag ... can make for a big, ungainly bag that's no fun to carry around. Naturally, its
never a problem when you're first starting out, but evolves into one.
In general, I like to carry a "sachel" sized shoulder bag, which will hold an SLR with a short lens attached and enough extra room in the bag for two accessories. Typically, this will be another 'small' lens and a strobe.
If I'm going to be shooting with my big telephoto, I'll use a dedicated carry bag for that, and then a sachel-sized bag for either a second SLR/lens, or just the lens & misc goodies.
Of course, all of this assumes that I'm travelling some distance with the camera. For shots around the house & yard, the bag stays inside.
-hh
PS: where I'm at today is that I think I want to go to wider straps on my shoulder bags. Probably something in the 1.5" range, maybe higher.