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.