The Gregory Baltoro 100 Pro backpack is an improved version of the popular Baltoro line. Due to its spacious 100-liter volume, there was a need for more support , so Gregory thickened the foam and increased the size of the frame to withstand heavy loads which we undertake. This makes this beast best suited for our biggest backcountry treks. Baltoro provides access from all sides - from above from below and from the front - so we never have to struggle to grab something what we need. Gregory equipped it with a dynamic belt system which adapts to our movements and holds him on his back when we climb over rocks and under branches. Air Cushion mesh located along each contact point , forming an ergonomic and breathable fit providing good ventilation while sweating. And as an added bonus, Baltoro now has an eco-friendly design: less carbon , partially recycled materials, PFC-free DWR and 50% less plastic.