I love using these decorating bags. They are very easy to use and they make my cake decorating hobby so much easier. These bags can be used by professionals and amateurs. I have never had professional bakers training, but I found these decorating bags so easy to use. The one downside is that they leak out of the top. However, this situation is remedied by sealing the top with some kind of tie. I love that they are disposable and I don't have to worry about cleaning them thouroughly. It is easy to keep colors separated. Use them with just a single tip or place a removable plastic holder in it to...