This bag fits my 35-40lbs silicone mermaid tail wonderfully. There is also room for all my extras - snorkle, goggles, tops, makeup! I can put the bag with the tail in it and put it on like a backpack and carry it where ever it needs to go. It is almost impossible to carry without a bag and this one works wonderfully. The only complaint is that sometimes the extra fabric gets caught in the zipper making it difficult to zip. I've trimmed some of the excess fabric and that has helped.