Made to fit the ERGObaby Performance line only, the Performance Cargo Pack is made of a rugged, durable polyester/cotton blend. The Cargo Pack attaches to the side buckles on either of the Performance Carriers, and features a generous main compartment with a side pocket, and a mesh outside pocket. With a Velcro flap, the Cargo Pack can attach to the carrier's waist belt when worn in any position. Sold separately.