Here is a link to what I call - "All you ever wanted to know about rice/corn bags" and MORE. I used the corn feed - had to end up buying a 40 lb bag (no bulk around here) but it only cost 7.50 and I've made a lot of bags for gifts and shared the corn with other quilters.
I made the one for the neck - made with a fat quarter and LOVE it. The only thing I did different was made channels in it so that the corn didn't all fall to one end. In fact, I made more than a couple channels. A great way to use some fat quarters you know you won't use otherwise.
I will take a pic and enclose it later - can't get to it now - it's in the bedroom and don't want to wake up my better half. This is MY quiet time - LOL!
Pat