Gregory's Baltoro Pro Backpack is best-used on the bigger mountaineering missions and longer backpacking trips. It has plenty of space for larger insulators, sleeping bags, and climbing gear. Gregory made the suspension system with heavier loads in mind, and the shoulder straps, waist belt, and back panel move with us for an easier time on the trail. We also like the removable SideKick daypack that can take our hydration reservoir and essentials for short jaunts away from camp.