The MotoSport.com RDRCO Hydration Pack And Reservoir Combo includes ONE each of the following: RDRCO Hydration Pack: The RDRCO Hydration Pack is great for your racing and riding moisture requirements. The pack has been designed with a strong four-point harness to help keep the pack secure while riding or racing. It especially works great with the RDRCO Hydrapak 70 oz. (2 Liter) Reservoir (sold separately). Fully adjustable around the chest and back for a secure one size fits all position. Four-point harness for comfort. Padded mesh backing. Heavy-duty YKK® zippers. RDRCO Hydrapak Reservoir: The RDRCO Hydrapak Reservoir is a 2-liter reservoir with a Plug-n-Play system to help you clean the bladder easily. It is also equipped with the Comet locking valve, which prevents any unwanted leaks or spills when riding.