I've been using a Mystery Ranch Men's Sphinx 60 Backpack for several years. It is large enough to carry everything I need for 7 days. Not super-light at 4.5 pounds, but super comfy. It has the best lumbar and hip support of any of the many packs I've used...including Osprey's best. Mystery Ranch also makes a water-bottle/accessory pouch that attachs to the shoulder straps.
