When I'm needing to frost a cupcake, cookie, cake, or treat and I don't have a pastry bag handy, I use a glad sandwich bag. I snip off a corner of the plastic bag and then put the frosting in the top of the bag and close. I can use the bag just like I would a regular pastry bag to frost and pipe and decorate. It has come in very handy for me many times in a decorating pinch! Thanks Glad for your many uses!