This vest is a complete system. It is fully adjustable for a snug, comfortable fit over body armor. The vest and pouches are made of 1000 denier NyTaneon and are lined for strength and quick extraction. The mag pouches have 1.5 inch elastic to secure the contents. On the back of the vest is a pouch for a HydraStorm Hydration System that can also be used to carry manual tools such as: sledge hammers, crowbars, etc. Also Streamline Load Bearing pack (60SLBP) or other additional gear. Weight 2 lbs. 7 oz.