We have been using the Kelty Redwing backpacks, as hikers, guides and travelers, for many years now. We just bought a new one as one of ours was, though completely functional, too ratty looking to take on business trips.New improvements:*The large zipper opening now wraps up over the top of the backpack, opening the large compartment fully, so its easy to insert a computer or documents into the sleeve that rests against the back. The models we have, especially the smaller one, are really difficult to access.*The gusseted water bottle compartments on the side are now made of cordura instead of mesh. This is why we needed to abandon our old ones for flying and business trips, the mesh became snagged and has holes in it. The cordura will last. Plus if you do have a wet swimsuit or something less savory balled up in there, nobody has to see it.*There are fewer little pockets inside the smaller zippered compartment. I doubt anyone ever used all the compartments in the old one. So that is streamlined. There was a nice small zippered area inside that small zippered compartment. I had a love had relationship with it. I always use it, but when flying, I have to empty it because it makes e the bag stick out too much to fit under the seat in front of me, and even too fat to fit in the overhead. There is now a tiny flat zippered area that could hold something very small and precious.*There was also a vertical zipper in the very front of the backpack. If you didn't zip it closed, things easily fell out. They got rid of that.*The shoulder straps seem stiffer, and I am hoping that feels okay when very full.This is one of the best backpacks for the money.It distributes weight very well onto the hips, with a very sturdy wide waist belt, and if you want to transfer more to the chest, there is a chest strap.The back is semi rigid and keeps the pack a bit off the back, making it less sweaty back there. It is also adjustable to torso length.The 44 liter size fits just about what you an fit in any rolling carry on bag. For lightweight backpacking, this will also work, as there are loops to attach sleeping bags, shoes, camping pads, tent.The cinch straps trim it down for when you need to make it look smaller or need to have it be more trim for squeezing through caves or something.Once I load it up and take it someplace, if I discover anything else, I will update this.I have recommended this pack to friends who also have used it for years.