Justin G.wrote a review of Arc'teryx Cierzo 18 Backpack - 1098cu in on September 2, 2012
Have used this bag as a daily backpack for 2 months now. Looks as good as new. Super lightweight, comfortable, well-designed. Interior pocket is is a nice touch, as well as attachment loop (good as a grab handle). Unpadded shoulder straps seem comfy to me, even with fairly heavy loads. This is a minimalist pack after all.
I used this to replace a beloved Patagonia Beeline pack because I wanted something lighter. I haven't missed the padding and straps. Haven't had a chance to use this in the mountains yet, but I think it makes a perfect bag for grabbing summits--right size for just a outer shell, water and snacks. If it won't fit in here you probably don't want to carry it.