I've made some and used kitchen towels as covers. Use 1 towel sewn lenghthwise and then across 1 short end slip the insert inside and use Velcro to fasten together. If you want use two towels together, velcro one end, but I found when you make the insert for this size you need to make channels(make rectangle, leave.opening to fill with rice, but before filling stich most of the way one way and then the other way. Create a maze. I generally have 4 channnels)