I made this from a free Craftsy pattern. I changed it up just a bit & filled the bottom (rolled area) with poly pellets. I don't use things that will attract bugs (like rice, beans, etc). I think if I ever made another one I would use something other than cardboard for the center (maybe some light but stiff plastic...like garage sale signs) that way if it happens to get wet or something spilled on it it wouldn't deteriorate. I never used the one I made but gave it to a friend of mine who said it would be perfect for her iPad.
https://www.craftsy.com/sewing/patte...pattern/132508