Spring 2014: This large volume trekking pack from Arc'teryx combines lightweight and durable traditional materials with our patented AC2 suspension system, delivering maximum comfort and load control in a lightweight package. The top-loading Altra 75 also has a full length inverted U-zipper for panel-loading convenience, and breathable shoulder straps, backpanel and hipbelt offer warm weather comfort. Laminated and padded compression wings provide zipper protection and storage. Space efficient compartments, one-handed timesaving closures and pocket configurations make Altras the lightest weight, fully featured bags in their class. Wingman™ side pockets wrap over the hip and are accessible without taking off the pack.