Longer distances and winter temperatures require extra room. The Optic 48 gives you that additional capacity without compromising your ultralight priorities. Proper load management, moisturewicking ventilation, and intelligent features keep you comfortable and mentally balanced from sea level to the High Sierra, because efficient trail travel involves more than a weight claim. AeroSpan is the ultralight evolution of our groundbreaking VaporSpan suspension. It’s delivering the same combination of 360-degree moisturewicking ventilation and tensioned perimeter frame load management while paying obsessive attention to weight reduction.