The Aircontact Ultra 45 + 5 SL Pack provides optimal comfort, cushioning and breathability with its Aircontact back system and Air Spacer mesh. Its Clip & Loop back-length adjustment and VariFlex ECL hip fins offer a tailored fit, distributing weight efficiently for long-distance hiking. The hardwearing performance fibers and Pull-Forward construction make the hipbelt easy to fasten and tighten, even with heavy loads. Plus, with an optional volume expansion of 5 liters, you'll always have plenty of space for essentials.