GREGORY OPTIC 48 BACKPACK Achieving fluid motion takes more than counting ounces. The ultralight Optic 48 combines weight-saving design with outstanding fit and load management to give you a low base pack weight along with mileage-crushing efficiency. Comfortable carry and thoughtful trail features keep your head in the game so you stay ahead of your thru-hiking itinerary. FEATURES AeroSpan suspension with EVAP moisture wicking shallow-depth ventilated back panel Ventilated, dual-density FocusForm shoulder harness and extra supportive hip belts with targeted comfort zones Leaf-Spring Lumbar pad for comfortable, energy-saving load transfer Ultra-light 7001 aluminum perimeter frame with Anti-barreling support Included custom fitted rain cover stows in the top pocket for quick access in unexpected showers Removable top zippered pocket to shed ounces and swap-in included ultra-light weather flap to stay protected (stows in top pocket) Sunglass QuickStow system on shoulder harness for quick, secure and scratch-free access to your shades without taking the pack off TECH SPECS Gear Capacity: 48L/2929 cu. In. Weight: 2.47 lbs0 Rain Cover Weight: .21 lbs Number of External Pockets: 3 Frame Style: Perimeter wire