Minimally worn and in pristine condition. Fits a 1.5 liter bladder in back and 2 soft flask bottles in front (not included). 4l packing capacity. Lots of pockets including a waterproof lined front zip pocket big enough for phone. Adjustable front to adjust for perfect fit. Also includes magnetic hose clasp and emergency whistle (sewn into front pocket). Lightweight soft fabric for comfort and breathability. Sizing (Small) correlates to shirt size and should fit snug to ensure minimal movement to avoid chafing