Features of the Ultimate Direction Mountain 4.0 Hydration Vest Sliding rail sternum straps Bottle holsters tighten to carry phone or camera Stretch mesh pockets Are phone compatible Redesigned trekking pole holder minimizes bounce and snaps out of the way when not in use New Comfort Cinch Technology provides a custom Fit with easy on-the-go adjustment 4-Way stretch material with dissolved thread stretches to Fit more and is lighter than ever Lat pockets for extra storage