those f-stop bags look awesome.
but I have a Clik Pro Elite and i love it. it's big but it can carry my 15" laptop, tripod, ipod, multiple headphones, 4 lenses, T2i, HVX, GoPro+helmet strap, all my filters, Beachtek audio mixer, HVX backup battery, Rode NTG-2 mic+windshield, gloves, all my camera manuals, all my lens cleaning stuff, hard drive, extra T2i batteries, sunglasses, and all my cables.
needless to say, it can get really heavy. but i love that bag, it's perfect for going on trips when you know you'll be shooting a lot and need all your gear.