STOP HERE IF YOU THINK PERIODS/MENSTRUATION/TAMPONS ARE GROSS!!
Moon cups are a reusable cup that women can use instead of tampons. I came across them when I was looking for an alternative to tampons. I had always thought that tampons were very wasteful and the cost each month was getting ridiculous. I was also concerned about the bleaches and other chemicals used in tampons that are no doubt absorbed into the body when we use them. I read heaps of different forums and advertising and finally decided just to give it a try. There seems to be even more information and discussion, and more products available now, so I guess they have become more popular since I bought mine about 5 years ago, which is great to see.
I wanted to write this because at the time I was looking at buying one, I didn't know if it would end up being a waste of money and it was hard to find information apart from endorsements on websites trying to sell the product. So if anyone has been wondering about getting a moon cup, or has never heard of them before, I can completely recommend them, I have had no problems and I love not having to worry about throwing away used tampons or buying more each month. If you want more of the (gory) details, I have read some really good explanations about similar products here and here.
I also use the reusable pads, washing them in hot water and ironing them between use, and I'm very happy with the product.
I'd be happy to answer any questions from my personal experience, but I can't say I'm an expert, I just know what has worked for me. There's heaps of information on the sites I've linked to, so that will help you to make a decision and I hope you will seriously consider this reusable alternative.
See Biome's range of menstrual cups (affiliate link).