ShelterLogic 4-Pack Canopy Anchor Bag, Black Constructed with ultra durable polyester fabric, 17.5-inch x 5-inch diameter size Innovative dual cylinder design wraps around canopy or shelter leg with heavy duty hook and loop fastener strips, tightens down fast Industrial grade zipper on top of bag allows wide open access for easy filling Use with spike anchor tab for additional temporary anchoring security Fits both straight and slant leg canopy frames.