The Arc'teryx Altra 62 backpack will pack your gear for trips ranging from 1 day to 4 days. This a very efficient, mid-sized pack, with a killer weight-to-carry quotient, that ultimately saves energy on the trail. -- Twin aluminum stays -- Double chamber top lid for easy access and organization -- Extendable top lid and extension collar -- Hydration sleeve external access point -- Large front kangaroo pocket for frequently used items -- Shoulder straps adjust height and width -- Back panel sits away from back to provide ventilation -- U-shaped zipper from easy access -- One-handed easy access pockets -- Load-distributing transfer... More