I love these wool dryer balls. They are very sturdy and tight. I have found that the drying time has been reduced while using them. It also helps to reduce wrinkles which is always a bonus. As a side note, I think the adorable lamb face on them is cute. These are larger balls. That is a plus as they allow more air flow between all of the clothes. The do come in a little bag for storage however I just use a small bin to put them in. They do get damp and I worry about them not fully drying if they are put back in the bag. The only part of these that I have a small issue with is depending on what is being dryed, it sounds like loud pounding in the dryer. Obviously since they are firm this will happen. I would highly recommend these and I will be getting more for my kids that are off in college. Saves time, energy, and no need for fabric softner which is also a money saving goal.