Ok does this pack exist. It must meet these requirements.
1. Able to withstand a thru hike or long treks
2. AT LEAST 40 liters of volume in the MAIN COMPARTMENT of the pack
3. A frame (removable or otherwise)
4. Under 2 lbs.
I know ULA packs and Gossamer Gear and Half Moon Designs. I am looking for anything different them those.