I really love the REI Flash 30 pack:
http://www.rei.com/product/778467/rei-flash-30-pack
Just 1.5 lbs!
The problem: I've ripped the back, between the shoulder straps, on two of these packs. It's just lightweight ripstop nylon, maybe 2.5 oz/yd^2, between the shoulder straps. I reenforced the last pack in this area, and it still eventually ripped.
I love the volume, general design, and weight of this pack. I've stored ice axes and trekking poles across the back, and used the quick-drawstring on the back to hold bulky clothes.
I want something similar to replace it... but without the serious design flaw of the light material below the shoulder straps. If REI put just 1/2 ounce of reinforcement in back of the straps, this would be an absolutely great pack... but of course they won't do that, because it would require interacting with the customer.
Any ideas for LIGHT replacements? I may get another, and hand-sew webbing across that weak point.