http://www.golite.com/packs-and-luggage/backcountry-ultralite

I've never used Go Lite but a 70 liter pack for 1.15 pounds, you'll be hard pressed to find another pack of its size and weight and current price on the website.

I use Granite Gear and they're proud of their gears (it expensive), but they are comfortable and light.
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It is one of the blessings of wilderness life that it shows us how few things we need in order to be perfectly happy.-- Horace Kephart