I tried this backpack locally and ordered it on Moosejaw online. The back support and wicking are every effective with plenty of adjustment and comfort. I went without the ACT Trail 32 because I don't need a sleeping bag compartment whereas ACT Trail 24 doesn't have it. I strictly use this for day/short hike. I love the side storage zipper for quick access to get energy bar and other small items. Love the Stow-it belt when I don't want to use it. That's a plus for sure.
I tried it at the store locally and this pack is the most comfortable support on my back and shoulder strap. I was going with 32 liters, but decided to go with 24 liter (without the sleeping bag compartment) pack strictly for day hiking. This pack has everything you need for comfort and support. Many good features to this pack will not disappoint you. I highly recommend it.