I was excited to see this in my birch box because of the sample size. While I'm not in the market for a new shampoo right now, I still thought the large sample would be great for travel. So over Christmas, I took it with me on vacation. Let's just say it was not what I had in mind. I have long thick hair so I don't need to wash it every day. But when I was it, I need to be positive that my hair gets clean. This shampoo just didn't give me the clean feeling I was expecting. As for volumizing, I did not notice a difference. On the plus size, I will have a a nice travel size bottle to put other shampoo in.