100 nylon nylon lining zipper closure surge classic 31l backpack updated professionals tech design organize electronics simplify life go dedicated lie flat fleece lined 15 laptop compartment protected checkpoint friendly travel flex vent flexvent suspension system flexible yoke built injection molded shoulder strap padded mesh fabric back panels breathable lumbar panels comfortable ventilated organization two teksever fabric pocket ability conceal contents front compartment padded tablet sleeve zip pocket webbing cord management external fleece lined pocket small electronics