Black Diamond Sonic Backpack - Fall 2013 A mid-sized, high-performance daypack with ergoACTIV suspension and zippered panel-loading access ErgoACTIV suspension with Open-air back panel and Swing Arm shoulder straps and Zippered panel access Soft, breathable 3D mesh on hip belt and shoulder straps Hip belt stash pocket, side stretch pockets and front compression cord Retractable trekking pole/ice axe loop and bike light slot and Hydration compatible Also available as women's-specific Chase