Product Description From rolling forest trails to exposed ridge scrambles, the Black Diamond Sonic Pack is a streamlined, mid-sized daypack ideal for any long, active day out. This high-performance pack features our ergoACTIV suspension, which uses a custom 3D pivoting hip belt and our SwingArm shoulder straps for complete freedom of movement. The zippered panel lets you quickly get to your food and extra layers, while the hip belt and side stretch pockets and front compression cord stash energy gels, a headlamp or a light jacket for quick access. From the Manufacturer From rolling forest trails to exposed ridge scrambles, the Black Diamond Sonic Pack is a streamlined, mid-sized daypack ideal for any long, active day out. This high-performance pack features our ergoACTIV suspension, which uses a custom 3D pivoting hip belt and our SwingArmTM shoulder straps for complete freedom of movement. The zippered panel lets you quickly get to your food and extra layers, while the hip belt and side stretch pockets and front compression cord stash energy gels, a headlamp or a light jacket for quick access.