The Pak-a-Roo line stuffs into their own built in pouch or pack. They are so convenient to take along anywhere anytime. Made of waterproof mini-ripstop polyester, they protect against cool temperatures and unpredictable showers. These are truly a must-have Outback product. This water proof seam-sealed breathable polyester has a moisture-wicking mesh lining, a stowaway hood in collar, a two-way zipper with storm flap, drawstring waist, covered zippered pockets. It also boasts a snap-open gusseted back vents, and scrunches into inside back zipper opening becoming a waterproof backpack with room to carry extra gear. We're proud of our Outback brand and what it means: superior materials and workmanship, authentic styles and new ideas, rugged details and components designed to head off foul weather ahead.