Menstrual Cups...
What are they?
Above photo: from left- the Keeper, Mooncup and DivaCup (please note the Mooncup UK now has grippers on the bottom of the cup like the DivaCup- tails have been trimmed to varying degrees)

L to R: Keeper Moon Cup size A, Keeper Moon Cup size B, DivaCup model 1 and DivaCup model 2.
I've found the perfect answer! I started my period when I was twelve years old and in the years since then I've used disposable pads and tampons, the disposable menstrual cups called Instead and three brands of reusable menstrual cups. Here are my personal experiences, and my recommendations.
I have personally used the DivaCup, the Mooncup UK, and the Keeper Moon Cup.
I first tried the DivaCup, but it did not work as well for me as I had hoped. Even though I didn't experience leaks with the DivaCup, it was a very uncomfortable fit because even when inserted with the top of the cup at my cervix and the tail trimmed completely, the bottom of the cup chafed my perineum- it was simply too long. Many, many women are quite happy with their DivaCups, it just wasn't the right fit for my anatomy.
Next, I tried the Mooncup UK. It was love at first try. I did have to trim the tail completely, but I have had no trouble with leaking or any problems getting a comfortable fit. If you have a low cervix, I highly recommend the Mooncup UK- I've recommended it to many women who have low cervix, and they too have reported getting a better fit with the Mooncup. Also, I prefer the Mooncup UK because it "pops" open easily.
Just last month, I decided to give the Keeper Moon Cup a try. Unfortunately, using the Keeper Moon Cup has not been as comfortable or as easy as using the Mooncup UK. I had to use a sterilized pin to finish poking through the tiny airholes in the cup that aid in achieving the needed seal. Even so, I do not get as comfortable of a fit. I plan to give the Moon Cup another try during my next cycle but I don't see myself switching over.
Other cups that are available for purchase include the Keeper and Lunette. I don't have or use these cups so I can't offer any personal experience but I will note the differences between the cups in the sidebar.Last but not least, you could save your local landfill tons of waste by using a menstrual cup and/or cloth pads. The cups are intended to last 5-10 years, so the initial cost is definitely worth it!
If you have unsuccessfully tried one of the brands of menstrual cups, there are some things you can do to improve your chances of success.
1) Make sure you kegel! I can personally attest that this works
2) Try the various methods of folding and inserting (instructions and pictures of folds can be viewed at the "MoonKeeperDivas" yahoogroup)
3) Try another brand... for example if the DivaCup doesn't work then try the Mooncup and vice versa.
The pictures below compare some of the different brands of cups, as well as the differences between the sizes of each cup. The cups with two sizes have different sizing recommendations, please consult the sizing for the brand of cup you decide to purchase as the sizing guidelines may vary a bit (the Lunette comes in only one size).
Above photo: from left- the Mooncup, Keeper and DivaCup
Above photo: on the left- the Mooncup, on the right the DivaCup, note the difference in shape (the Mooncup stem has been trimmed).





