Arcteryx is known for their innovative products, and this groundbreaking model brings a new level to performance with a completely waterproof design Made with revolutionary 420Advanced Composite Textile VaporTight material to keep contents dry. Top-loading main compartment features a DryBag lid-closure system for easy packing and added weatherproofing. WaterTight zippers on all pockets prevent water penetration. All seams are sealed for weather-tight protection. New, Gridlock adjustable shoulder strap suspension system lets you adjust vertically and horizontally for a perfect fit. MonoFrame backpanel is thin and light with EVA foam, Kydex plastic and 2 aluminum stays to create a direct link between back, suspension and bag. Radially formed shoulder straps and Radially formed Binary hipbelt offer a nice fit. Hipbelt suspension features a Load Transfer Disc for superior range of motion and easy disconnect from pack. Simply grab hipbelt at center, twist in counter-clockwise direction and belt releases from center disc reverse actions to connect. Hydration-compatible design features reservoir pocket with a waterproof port for drinking tube reservoir sold separately. Zippered large Kangaroo side pocket and zippered smaller pocket on other side for storage of oft-used items. All molded components and suspension system are laminated and bonded for superior strength.