The GGG shooters squeeze bag is perfect for the small changes in elevation and windage needed to hit the target from the prone or seated position. They are featured in three sizes to accommodate multiple rifles and shooters. The unique hourglass shape allows the shooter more surface area where you need it and is slimmer where you don't. There is a hand strap along the side and one end is closed with hook and loop so that the used can customize the amount of fill in the bag. The fill for the bags are sold separately. The user can use any fill medium that they choose, sand, rice, Etc.