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Increased capacity means heavier loads, and when full, a larger pack means more distance between the load and the user’s center of gravity. Response Pro compensates for these factors with a larger diameter aluminum wishbone frame, a full-back-length internal frame sheet, and an upgraded non-pivoting Response Pro 3D AIR hip belt to provide increase support and stability throughout the entire chassis.RESPONSE A3 SUSPENSION: Auto Angle Adjust (A3) hipbelts and shoulder harnesses adapt to your unique body geometry for a custom fit every time you shoulder the pack. This patented system allows both harnesses and both hipbelts to rotate independently of each other, delivering a dynamic yet stable ride that adapts to your body's movements over different terrain. Response A3 helps align your center of gravity over your walking path, saving energy you’d otherwise spend on stabilization. That little bit of energy saved adds up with every step, increasing your overall efficiency—and preserving your bliss—as the miles tick by.