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The UNLTD AntiGravity 64 Backpack is a big step up in packing technology. Osprey looked at every nook and cranny when it came to designing this stable and easy-access trekking bag. That all starts with the UNLTD AntiGravity suspension system--utilizing vertical and horizontal wire steel framing, a formed back panel, and a Carbon DLS secures even the heaviest hauls to the center of your back to become one with the bag. And even more than that, the UNLTD AntiGravity's highly adjustable setup can be tuned on the fly thanks to the easy-grab straps. So if it's ever feeling loose, just cinch it up and keep pushing forward.