Clik Elite can haul gear, water and equipment.
I just received the 2011 Catalog at home and it stated that the new packs would be available around March 15th.
http://www.clikelite.com/wp-content/uploads/2011/02/Clik_Cat_2011_email.pdf
They also sell Camera Capsules that can go in other packs.
The 2010 Products:
http://www.clikelite.com/shop/
Tha Contrejour 35 or 40 looks nice (Internal frame).
Mountainsmith is another brand:
http://www.mountainsmith.com/products.asp?productId=275&categoryId=13&s ubCategoryId=14&subCategory2Id=0
Mountainsmith also sells removable Camera Cubes:
http://www.mountainsmith.com/products.asp?productId=290&categoryId=13&s ubCategoryId=29&subCategory2Id=0
The Lowepro that Andy mentioned looks nice too!
Also check out F-Stop Packs: (Internal Frame)
Some of the F-Stop Backpacks appear to be Airline Carry-On ready and they also have removable internal Camera packs (ICU).
http://fstopgear.com/en/product/mountain
Video Below middle of the page "Tim Kempe"
http://fstopgear.com/en/product/mountain/loka
You can usually fit a 100oz. (approx. 3 liters) water bladder in a laptop compartment on any of these packs that have that feature.
Rich