Multi-day trips into the wild require a steady packhorse that can shoulder an expanded kit, and the Deuter Aircontact Pro 6515 SL Backpack features the volume, creature comforts, and burly construction you need to reach those untouched places. Designed with an adjustable fit, a three-liter hydration sleeve and tube port, and plenty of attachment points, this versatile heavy-duty collapses down for weekend use and expands out to 80L for extended expeditions.