check out Elemental Horizons packs ,here is what Will says in his review
The short answer is the Kalais is one of the best backpacks I have ever tested, and I have tested a lot of packs. As with the Aquilo, Elemental Horizons got (almost) everything right the first time, and the Kalais is another winner(In response to my review comments, Elemental Horizons has corrected the problem with water bottles falling out of the side pockets by widening the bottom of the pockets so the bottles now sit deeper in the pockets).
The four-pull hipbelt tightening system on the Kalais is remarkable, it allows you to tighten the top and bottom of the wide hipbelt separately, conforming the hipbelt around the hipbone, allowing the pack to comfortably carry heavier loads, with total weight transfer, and not slipping off the hips.
Elemental Horizons uses a removable contoured aluminum stay that is similar to the one used by Gossamer Gear and Six Moon Designs, but its integration into the pack is much better. Rather than a simple straight sleeve on the inside of the backpanel, the stay is more solidly anchored at the top and bottom of the pack, so it transfers weight to the hipbelt better, as my testing results indicate.
Elemental Horizons’ Aquilo pack, which received the coveted Highly Recommended rating from Backpacking Light Magazine (subscription required to read the article), you pick the materials and features you want for your pack ,the Aquilo sounds like the size you are looking for. Here are some photos of packs in different materials he has made.
Here is Sgt. Rocks video review.