Camera Backpack

[vonDrehle]

I have been looking at some camera backpacks and was hoping I could get some opinions and suggestions. I have already bought one backpack that ended up being to small for my taste and breaking within the first two weeks I had it.

Contents:
-Canon EOS Elan 7ne
---28-105mm
---17-40mm
---400mm
---Undecided Macro Lens
---Undecided Lens for the 100-300mm range
-Film
-Filler Flash
-Light Meter
-Filters
-Tripod and/or Monopod
-Some Extra Stuff (Snack, Water, ect…)
(Words in green I am expecting to get in the future, near and far) I am not 100% sure on my purchases in the future so I could end up with more or less lenses then I believe.

The ones I have been looking at are:

Pro Trekker AW II (http://www.lowepro.com/Products/Backpacks/allWeather/Pro_Trekker_AW_II.aspx)

Photo Trekker AWII (http://www.lowepro.com/Products/Backpacks/allWeather/Photo_Trekker_AW_II.aspx)

Dryzone 200 (http://www.lowepro.com/Products/Backpacks/waterproof/DryZone_200.aspx)

As you can I want a large bag that can carry my current equipment and my future. I figure if you are going to spend money on a backpack, why not be able to use it more than a year. I will mostly being using the backpack for Hiking in the mountains and for whenever I will need several different lenses with me. And opinions on the bags listed above and suggestions on some other bags are appreciated.

Thanks.