Removable top-lid converts to DayLid daypack Top to bottom suspended mesh wraps shoulders, back and hips for a fully integrated backpanel fit Front stretch mesh pocket and zippered hipbelt pockets for quick storage Side panel zip provides quick access to main compartment Internal hydration reservoir sleeve accommodates up to a 3L reservoir (sold separately) Recommended load range: 35-60 lbs. - Pack weight 4.9 lbs. for a size Small at 31.5 X 15.35 X 12.6 in.