I think they do have some, but I don’t know what. My husband only drinks unsweetened, so on our Panama Canal cruise we packed a box full of Silk cartons (the shelf stable kind), and carried it on. It was perfect. We brought it on the plane, so we wrapped the whole thing in lots of Saran Wrap. One box did get a small leak but it was contained. I know this sounds extreme, but it may be something to consider to get exactly what you want. And you probably need less than we did!