Hydraulics 1.5L LT run-specific reservoir included in the dedicated sleeve with direct-zip access and hose path for easy loading Two extra-large stretch mesh soft flask harness pockets and four lower stretch mesh harness pockets keep essentials accessible (flasks not included) Vertical zippered harness slash pocket for valuables or phone Padded mesh straps and snap-in adjustable/removable dual chest straps provide comfort and stability Front panel zippered compartment, two open stretch mesh side panel pockets and a stretch mesh front pocket provide enough room for extra layers and calories Tuckaway safety whistle for safety on any trail Trekking pole/ice axe attachment for a streamlined carry