Foldable Filled Sandbag with Single Handle for Weights and Resistance Training Fashion Canvas Weighted Sandbag polyester used for simple and this is a luxurious and perfect for and Pilates. Fine used for inner cover, is , water and leak . /runner used in outer and inner covers and this is a very soft handles, convenient for carrying. Using sandbags enable your muscles to relax and your energy to ground, provides a lift in seated poses.