Jared M.wrote a review of Kelty Red Cloud Backpack - 5600-6650cu in on August 5, 2012
I have had my RedCloud 5400 since 2003. The pack is very durable and can hold a LOT of gear (if you fill it, you probably packed too much). I have used this pack for Philmont and many scout trips when I was younger. Now, the majority of my trips are week-long trips and it has held up through them all (Grand Canyon, Shenandoah, Rocky Mountains). This pack is a great backpack for those new to backpacking. The downside to this pack is it is heavy compared to the more expensive packs (Osprey, Gregory, etc.)
This pack is very easy to adjust the straps and I feel it has the right number of compartments. The hipbelt is very heavy duty and I find the pack to be pretty comfortable.
All in all, this pack is a great backpack for those new to the hobby. I think the bag is certainly on the big side if you will only be doing weekend trips. I would go more towards 4000 cu in. But, this will last you a long time. I know there are better backpacks, but I just can't part with the RedCloud. If you are an experienced backpacker, you probably realize there are lighter, more comfortable bags on the market which will cost a bit more $$$.