All new from Arc’teryx: Alpha FL Climbing Pack. As a part of the SS 2014 collection, the Alpha FL Pack will continue their AC² (Advanced Composite Construction) pack technology that focuses on advanced materials. The pack is made out of a durable, lightweight and weatherproof N400r-AC2 nylon ripstop fabric that maintains flexibility under extreme temperatures. It also features a WaterTight zipper and a waterproof Rolltop closure, which allows you to expand the pack when you need to fit in that last piece of gear. All that in 680 grams. Coming soon.