The Stratos Series are our durable yet lightweight backcountry adventure packs with a design far from general. The AirCore backpanel suspension borrows from the innovative and award-winning AirSpeed backpanel suspension found on our Atmos Series packs. Two 5mm fiberglass struts with a center stabilization disc anchor into top and bottom polycarbonate high-impact composite molded wings. A tensioned contoured mesh backpanel provides a form fitting and stable carry while allowing full air circulation.