ULA Cricuit is worth a look
With a 25 - 35lb load the ULA Circuit is a perfect pack for my style and needs. I know they aren't widely available but ULA is a great company to order from and they somewhat custom fit every pack. You select a size for back and waist. The circuit is a light framed pack coming in at 36 ounces. It has very few "extra" pockets but for me it's just what I want. I found that most "light" packs cut corners on shoulder and hip padding where as the circuit is extremely comfortable (for me) with loads up to 40lbs. It's excells at transferring weight to my hips while maintaining a close and solid fit to my back and shoulders. All this being said the pack is certainly a warm pack to wear but I have yet to find a pack that doesn't leave my back and arms sweaty when temps are above 50.