evo.com | Arc'teryx Day Packs > The Arc'teryx Aerios 18L Backpack is the pack that makes you forget you're wearing a pack. Featherlight Hadron(R) fabric keeps things tough without the bulk, and shoulder pockets that are built for soft flasks keep hydration close and your fit dialed on long ascents. Adjustable Sternum Strap Internal Security Pocket with Key Clip Volume 18L Body 210d Cordura(R) Nylon 6,6 and 6.5mm 200d Twisted Vectran Full Grid / 161gsm 93.6% Nylon, 6.4% Polyacrylate Dimensions Length: 49cm / Width: 24cm / Depth: 19cm | Arc'teryx Aerios 18L Backpack 2027 in Brown | Nylon