. Arc'teryx carefully considers every detail in its outdoor gear to ensure it helps and never hinders your journey. , This 'Alpha AR 20' backpack is made from durable, waterproof ripstop, External bungee cord holds a water bottle, helmet or tools, Easy-to-open drawstring top with RollTopTM closure to keep everything secure, Lightweight construction makes it comfortable to carry Wear it with: Arc'teryx Jackets, Arc'teryx Trousers, Arc'teryx Base Layer, Hoka One One Boots.