The small bags that pillowcases come in are really sturdy and have a zipper. I use them for many things, but they are especially fine for knitting needles. I like to knit in the round, and I frequently lose one needle for a set of four. Alternatively, sometimes I need a 9 inch double pointed needle for a sleeve or baby cap, but a 16 inch one for sleeves, or a 24 inch one for a whole sweater. Thus, I have many needles in any given size and I find these sturdy bags perfect for keeping them together.