This High Peak Adrenalin 75 + 10 is the largest pack we have. Even for its huge size, it is incredibly comfortable. The entire pack adjusts from extra short to extra tall. The mesh back keeps the carrier comfortably dry. The top of the pack detaches for fanny pack. There is a built-in hydration system along with an ice axe holder. There is even an easy-access compartment with a rain cover / poncho. There are numerous compression straps to secure both internal and external loads. This pack is officially 6,500 cubic inches but weighs only 4.75 pounds. Although this pack is Expedition-quality and compares with packs in the $300+ range, we have a special price on this great backpack of only $110. We ship Nationwide at actual shipping costs; no handling fee or mark-up. We accept PayPal, M/C, or Visa for items shipped.