eoGEAR Zippered SeatBag 2.3-IA (for round seatposts only) DESIGNThis bag is for those looking for something larger than the typical mini wedge bag. It is about twice the size of those. It attaches to any round seat post up to about 35mm in diameter with an integral bracket or clamp (it will not attach to oval posts). It is VERY fast to attach and detach. MAIN COMPARTMENTThis bag has one main compartment and an outside smaller pocket. Holds a small jacket, arm warmers, repair kit and snacks. It has an easy-to-use rugged #8 water repellent horseshoe-shaped zipper. OUTSIDE POCKETThe outside zippered pocket is a good spot to store cash and I.D. It will hold the optional vinyl wallet (# 4915). Also included is a lanyard for your keys. It has a pair of pleats in the fabric to accommodate bulkier items. CONSTRUCTIONThe exterior of the bag is constructed of rugged 400-denier Nylon Pack cloth or 420-denier Ripstop Nylon fabric (with a water-repellent coating on the inside of the fabric; we don't use cheap polyester fabrics like some imported bags). The main compartment has heavy-duty #8 water-repellent zipper. The outside of the bag has reflective strips for use in dim light or night riding. Designed & Crafted in the USA