I messed with this pack in Schnees last night....pretty sure their sandbag was a 50 lb one. I was really impressed with how this frame felt, good compression, and the shape of that zipper is nice, skinning up at the bottom where the pack flares out helps keep stuff from flying out. Seems like a good daypack option if you want something flexible, the framing has a good pivot to it, and the MR yoke is pretty sweet. The belt is a lot smaller than the nice or guide lite frame, but the lumbar wrap and load transfer, as well as the power pull really make it stand out.