Longer distances and winter temperatures require extra room, and the Gregory Optic 58 Litre Lightweight Hiking Backpack gives you that additional capacity without compromising your ultralight priorities. Proper load management, moisture-wicking ventilation, and intelligent features keep you comfortable and mentally balanced from sea level to the High Sierra, because efficient trail travel involves more than a weight claim. Features and Specifications 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 Quick access on-the-go water bottle stow access on both the right and Left sides Oversized, durable front stretch mesh pocket for quick access organization Dual zippered hip belt pockets provide secure, easy to access storage Dual stretch mesh side pockets with Large capacity for bottles, camp sandals, trekking poles Dual adjustable attachment loops and upper shock locks for trekking poles or ice axes Ultra-light V-Compression system on side and bottom of bags Lower side compression pass-through on side pocket for over/under option Gear attachment points on top pocket and main body Weight: 1.14 kg, stripped weight: 1.10 kg Maximum carry weight: 16 kg Gregory Optic 58 Litre Lightweight Hiking Backpack