This durable black pack is made from DuPont 500 denier Cordura(R) nylon fabric.  The capacity is 400 cubic inches, enough for a picnic!  This pack firmly attaches to any standard rack that fits over the back wheel of a bicycle.  It attaches quickly with no tools and can also be removed and carried by the grab handle or shoulder strap.  There is a mesh back pocket, a zippered back pocket and several large internal side pockets.  This is a terric accessory for a road, trail or mountain bike ride.