I have the kuiu icon 3200. works as a really nice day pack and i've had up to 50lbs of gear in it so far. can go overnight/multi-day in it easily. comfy, the frame fits me well. for an ultra light day pack i'm looking at getting just a small belt pack, but that's not good for packing out anything bigger than a grouse haha

i'll probably go exo for my next pack to try it out, but for something bigger in the 5500+ cubic inch range