folded fabric=bag?

[bluebubble]

a customer at work a while ago was telling me about some bags that she makes which are a big square of fabric folded a few times then sewn around the edge. she said that when it is finished it has little pockets all over and has no raw edges. does anyone know exactly how this type of bag is made? from the quick description that she gave i haven't been able to work it out. thanks for reading! hope someone can help!