Achieving fluid motion takes more than counting ounces. The ultralight Optic 48 combines weight-saving design with exceptional 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.
AeroSpan is the ultralight evolution of the groundbreaking VaporSpan suspension, delivering the same combination of 360-degree moisture-wicking ventilation and tensioned perimeter frame load management while paying obsessive attention to weight reduction. Using body-mapping techniques to target friction and impact points allows Gregory to eliminate hotspots without excess padding. FocusForm shoulder harness and hipbelts and LifeSpan foam provides lightweight comfort that outlasts other weight-conscious cushioning materials.
Measuring the back length
Measure with a tape measure along the spine from the 7th cervical vertebrae (the spinous process is easy to feel from the outside at the lower end of the neck furrow) to the iliac crest (at the level of the upper bony hip structure). Measure two or three times to get an accurate result. If you are between two frame sizes, the smaller size is right for you.
XS = 36 cm - 41 cm
S = 41 cm - 46 cm
M = 46 cm - 51 cm
L = 51 cm - 56 cm