I made a weighted blanket for my nephew's son. He found a source of plastic beads that can be washed and bought the weight recommended. We measured the volume of the beads and then calculated the amount of beads we wanted in each "pocket". I double stitched channels into the quilt top, then poured the beads into all the channels and carefully stitched the pockets up as we worked across the channels. It took a while and I am glad my nephew helped with the handling of the quilt. I managed to miss most of the plastic beads as I stitched but did stitch one of them into the seam. I was surprised my old Viking D1 nailed that bead without blinking!