From what I gather, all the Envirosax bags are very practical. They are small, easy to store in a purse, easy to find if you pick the right colors, and carry alot of items at once. One downside is that you do have to fold the bags a little bit. Its not fast and easy, but I suppose that its a decently good solution. If elastic was used, then the elastic would probably stretch over time. Also, these bags can be washed. Remember, you need to wash these from time to time. Too much dangerous bacteria hitch a ride on these bags into your home! Its been researched.... wash your reusable bags regularly!