These bags are made of fine velour that looks similar to flocking on a very tight weave base fabric. They are 8-1/4"x8" with a 5" sewn-in, round bottom panel. Some variation in exact color may occur from bag to bag.
As tempting as it is to call this astral projection, that really isn't what that means. Still, you can put stars and constellations on the walls and ceiling.