The Mountainsmith Approach 40 is the quintessential, do it all pack. The convenient panel load style and carry on size make this the perfect travel piece for weekend get aways while the backcountry features and technical suspension allow this backpack to shine on gear intensive day hikes and fast overnights. The 40L size is best suited for small and medium torso users. The innovative ICS Cup (Illiac Crest Shelf) hipbelt transfers and locks the pack load onto the hips, the Delta Wing Compression system pulls the load into the lumbar region and focuses on the Lumbar Control Point pad on the lower backpanel to fully secure the pack load against the user's major weight bearing point, the lumbar/sacrum region. All this while the Anvil Airway backpanel keeps you cool on the longest trail day.