Summary: I've tried to like this bag for a long time. It's well made but use it now for my secondary equipment which stays in the vehicle. It's more like a small daypack bag than one to take all you need into the field. I switched to the Lowepro Photo Trekker AW II Camera Backpack. I do not find the Lowepro too heavy as I do not pack it full of equipment, however, the ergonomics is so much better. The Lowpro provides better organization and easier access to what I need.
Summary: I've had mine for a little over 3 years now, and I absolutely love this bag. As others have said, it's very good at protecting equipment inside, and is well-made and tough. It is pretty rigid, which is great for protecting its contents but it does prevent it from being compressible to fit into tight spaces. For a photo backpack, I think this is a trade-off worth making. It is sized perfectly for sliding under an airline seat in coach.
Summary: Before buying the KATA R-103 I had a separate portfolio attache for my laptop and a holster case with a modular attachment for a DSLR with an 18-70 kit lens and an 80-200 lens. It was incredibly tiring and painful to carry so many bags whenever I traveled. Now I carry my DSLR with the 80-200 lens attached, the 18-70 lens, spare camera batteries, a camera battery charger, rocket blower, CF card reader, lens pen, notebook and notebook charger, MP3 player and headphones all...
Summary: I saved for 2 1/2 years to purchase a Nikon D90. It came as part of a package that included, amongst other items, a camera bag. While I'm sure the camera bag was fairly reputatble, it just wasn't working for me - it was over-one-shoulder style. The first day I had the camera, safely secured in the bag, it fell a grand total of 3 inches. To my astonishment and dismay, the housing on the primary lens was broken.
Summary: Easily holds my Canon digital rebel XT with 70-300 IS in the center compartment, even with a hood attached. Add my 17-55 f2.8 IS, a 50mm f1.8, flash and some cleaning supplies and there is still plenty of room. There are extra pockets for cards, batteries, etc. I like the easy access for the center compartment. You can also access items around the outside of the main compartment by only unzipping one side of the pack. The backpack is sturdy and well made.
Summary: I love this bag! My gears are very secure in the padded compartments, and my laptop is not squished despite filling up the bag. I especially love the fact that when I put on the bag there is a slight gap so my back does not get sweaty. I just don't like the pockets which cannot hold many things. And I don't like that the raincover is not attached to the backpack, unlike in my Lowerpro Mini Trekker. But other than that I'm quite satisfied with this backpack.
Summary: First off, let me say this is a well made bag with lots of interesting features. The velcro draw string bags for small items that can fit into each compartment are really nice for holding all the little things that seem to fall out when your rummaging through your camera case (IE, wires, memory cards, etc).