They were super fast and easy to make. I just cut out some shapes, sewed them together with rice in the middle. For size reference, I traced a cd for the circle one. I also sectioned off the long one so it would keep the rice evenly distributed. These packs are great. We'll be keeping ours in the freezer for bonks, but they can also be warmed up nicely in the microwave. They do a pretty good job maintaining their heat/cold.