G'day Leon,
If you want "the camera bag" you must get a Lowepro for starters....
Now, You want a camera bag that can carry a pro DSLR, 2 telephoto lenses, 3 other lenses, accessories and all ? Waterproof most important...
I have a Lowepro CompuTrekker Plus AW Camera Notebook Backpack
This is the KING of the Lowepro for carrying quantity, safely and confortably camera gear..... you can also carry a 17" laptop if you want...
http://products.lowepro.com/product/...AW,1925,16.htm
Search on Ebay.... you will pay around $110 - $130 for it comparing to double the price on the shops.....
cheers