The Wanderlust Shenandoah seat bag offers the perfect solution for your biking carry on. No more sweaty back and cumbersome load with this bag. Pack the Shenandoah with your all clothing and sleeping gear, attach it to your bikes seat pole, and you are ready for an epic biking adventure. The bag is made of lightweight XPAC fabric with a four layer sailcloth style laminate, an extremely durable yet lightweight construction that is also waterproof. Bag attaches to your bike seat via Velcro webbing and straps along with locking cam buckles, so it ain't going nowhere. Holds up to 6-12 liters volume.