Fill, sew, repeat, all the way to the top. Like conjoined beanbags.
Then I stitched a simple zippered pillowcase out of flannelette, and anchored ribbons in the inside corners of the pillowcase to tie to the ribbons anchored to the shower curtain, so it wouldn't muddle up inside.
Here's the weighted blanket in action.
That there is my long, lanky boy, getting some downtime in the hard drive compartment of his computer desk! It seems that Ry had figured out the same thing - using compression to Center himself in his body. Kinda quirky, but pretty cool that he figured that out!
More sensory tools to be shared in the days and weeks to come, once we take some more photos.