Not my fav way to sleep . . .
I knew what I wanted but until yesterday couldn't find it
I found it at Canadian Tire
but you can find it at amozon
it is a Samsonite royal traveller convertible travel comfort pillow
It has a draw string to Horseshoe it, tight or loose.
I picked it up by one end and shook the contents to one end
and ended up with it full to about 16" with 4" of loose bag
used the draw string to tie it off like a balloon end
now it was the right density for to support my knees up a bit for me to have an awesome sleep.