Salsa EXP Series Seat Pack. The EXP Series Seatpack keeps gear high centered and in line with you and your bike. Much like a dry bag or stuff sack the EXP Series Seat pack fits a wide range of load sizes and dutifully carries anything you need on your next two-wheeled mission.Water-resistant welded construction with waterproof fabricsDurable 500D coated nylon material strategically placed in high wear areasStretch cord storage on topRoll type closure with buckles and air purging valve that allows for managing overall volumeCapacity: 6 - 14 Liters