1600 cubic inch pack with a 100 oz (2 Liter) pressurized water system. Molle attachment points. Insulated Tube. 500D Cordura. Two large stowage compartments with separate, insulated compartment for the Geigerrig Hydration Engine. Back ventilation. Compression straps. Bed Roll Straps. Box-stitch reinforced pack handle. Load bearing waist belt with molle attachment points. Additional interior utility organizer and mesh pockets. Carry it. Molle to it. (Length 21.5 Inches. Width 13 Inches.)
Don't forget to buy a filter. This reservoir is filter-ready. Also, you may want to consider buying a bulb holder if you are retrofitting to another pack -- not required, but nice to have.