My Superior Wilderness Designs 40L Long Haul. I've tried a quite a few packs over the years and none stuck. This one has been perfect. It feels like it was built for my body. Love all the customizations I was able to make on it. The pockets have tons of room, compacts down small if I don't have it loaded up. The waterproof material.
Just everything. There isn't a single thing I don't like about it.