Cool Runners Tunnel Hugging Non Constricting PVC Dog Agility Tunnel Bag Set 10" x 10" Compact Footprint which Slides Under the Sides of the Tunnel and is Less Obstructive to Handlers Holds 20 lbs of Dry Sand to Effectively Hold and Cradle the Tunnel The 10" Wide 19oz PVC Strap Hugs the Tunnel Without Constricting it Bags Contain Velcro Flap Openings for Easy Filling The Product is Designed to Hold Sand or Water Bladders (Not Included)