The Gregory Z pack 3560-3950cu in Anti-Gravity internal frame pack shaves the weight but not at the expense of comfort and support. At just 3 pounds the Z Pack is light enough for the most serious ultralight fanatic but sturdy enough for those of us who like to tote it all.
Description from backcountry:
The Gregory Z pack 3560-3950cu in subscribes to the theory that light is right, but that there is a right light. Stick with what you need, and get rid of what you don't. But if the pack can't carry its own, it doesn't matter how light it is, now does it? This way of thinking earned the Z Pack Backpacker Magazine's Best Weekender Award in their 2004 Gear Guide.
The Z Pack shrinks down for the shortest of trips, and even sheds an additional 9 ounces with a removable framesheet and stay. But it also handles a 40-pound load with ease during a weeklong trip through Utah's Wasatch Mountains. With a sewn-in Sport harness and Gulwing Plus waistbelt, it's not just a lightweight sack. Instead, the Z Pack is loaded with these lightweight conveniences: top and side access for easy access to every nook and cranny; a generous front bucket pouch; and a second front pocket and top pocket, both with water resistant zippers. Stuff this pack full, but don't be surprised if you forget you have it on. Three different sizes available.
Bottom Line: This pack might be light in weight, but it's no lightweight.