Clik Elite CE800BK Photography Pack Pro Express 2.0 Bag, Black Large zippered external side opening allows quick access by swinging the bag to one side. The Pro Express 2.0 features a hidden tunnel-sleeve located behind back panel slides over the handle of a rolling carry-on bag or trolley providing fast and efficient weight-free carriage.* The tunnel-sleeve feature doubles as a 2L bladder compartment if desired. Bladder not included. Proprietary and patent-pending ClikDraw system including a camera tether that attaches to a shoulder strap of the Pro Express via a rock solid Black Diamond carabiner. Compartment lined with EVA foam for carrying a 15 laptop.