Either zippered or drawstrings. Great project bags for knitters and crocheters. Good size for socks and shawl projects. A 100% high quality cotton fabric is used for the outside and inside of my bags with lightweight interfacing in them. I don't pre-wash the fabric. If you wash your bag, please wash in cold water and air dry and iron on medium heat. If they are pre-washed I will indicate it. I live in a smoke free, pet friendly home.