Erin.Lan Sock Project Bag is thoughtfully engineered to be the only self-locking project bag on the market. This drawstring bag doesn't come open until you pull it open. Also, it's fully lined to ensure that your tools and projects stay safely inside, undamaged and untangled. It has a flat, square bottom and a snapping belt clip, which makes it easy to carry either in another bag or on your belt. Bag measures approximately 5” square on the bottom and is 7” tall. The Sock Project Bag is made of 100% machine-washable cotton!