Refill beanbag bladders. All of our beanbag bladder covers are made using 70% polyester, 30% cotton fabric with an AEGIS anti-bacterial, anti-mold finish. Our beanbag fill is 100% high density virgin fill. All of our bladders are constructed using double stitched seams for greater durability and a double zipper which is closed, snipped and glued after filling to ensure that children and infants are safe and not in any danger of suffocating inside an open bladder full of beads. Round inserts can be used with all of our round seat covers. 4 cubic feet of fill.