VaporSpan ventilated backpanel with specialized mesh panels to provide anatomical support Comfort cradle hipbelt with seamless design for hotspot free comfort Hipbelt zippered pockets large enough to fit most phones Padded shoulder straps with smooth surface, breathable mesh for close to skin comfort Interior hydration sleeve with Speedclip hydration attachment system compatible with Gregory Hydro reservoirs (reservoir not included) ZULU 24 LT