Introducing the Wodsox Sandbag designed for old school heavy grunt work WODs. All our bags are heavy duty double stitched and come with an inner filler bag for the sand which is protected by a double stitched zip and strong velcro closing. This system ensures no loss of sand throughout your workouts. These bags have beeen designed to replace the traditional D-Ball, as they can be emptied and refilled anywhere around the world making them more transportable. Filling Material is NOT included - we recommend kiln dried sand and will provide a link after purchased and inside the box with the purchased bag. Bulk discounts available on enquiry, please get in touch to kit out your Box.