Measurements
The measurements for the cups
Smaller Sizes:
Divacup – 4.1cm wide 5.7cm long (7cm including stem)
Femmecup – N/A
Keeper – 4.4cm wide?, 5.4cm long (7.9cm including stem)
Lady Cup – 4cm wide, 4.6cm long (6.5cm including stem)
Lunette – 4.1cm wide, 4.7cm Long, (7.2cm including stem)
Mooncup (UK) – 4.3cm wide, 5cm long (7.5cm including stem)
Mooncup (USA) – Suspect same as Keeper
Larger Sizes:
Divacup – 4.5cm wide, 5.7cm long (7mm including stem)
Femmecup – 4.5cm wide, 5cm long to base of cup. (7.3cm including stem)
Keeper – 4.6cm wide, 5.4cm long (7.9cm including stem)
Lady Cup – 4.6cm wide, 5.3cm long (6.6cm including stem)
Lunette – 4.6cm wide, 5.2cm long (7.2cm including stem)
Mooncup (UK) – 4.6cm wide, 5cm long (7.5cm including stem)
Mooncup (USA) – Suspect same as Keeper
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About
A menstrual cup is form of reusable menstrual protection. It is inserted into the vagina to collect menstrual fluids. Once in place it forms a seal, preventing blood flowing out of the vagina by collecting it in its “cup” shaped reservoir. Unlike a tampon which absorbs the blood along with the vagina’s natural secretions, a menstrual cup simply holds the fluids until you remove it – so they do not dry out the vagina and do not hold the TSS risk that tampons do.
They hold around 20-30ml, which is for most women will cope with a full day without emptying, and at most perhaps you would need to empty it a few times a day for a very heavy flow. A menstrual cup will last (with proper care) for around 10 years, perhaps longer, so while the initial outlay is high, it pays for itself with savings pretty quick.
This is a sister site to www.clothpads.org. For information on cloth pads, please check that website.
This blog is a place to find information about the different cup brands I know about. All the brands I am aware of, are listed in the menu – Clicking on these brand-name links will take you to a page of information I have about them.
Menstrual Cups 
Hello… I found your article very interesting in the comparison of all menstrual cups. I am socio-medical specialist and found that it is very important to know this information, specially when you are talking about a ginecological product made of ginecological silicon. I don´t know if your article has been publish in spanish, buit would like to make a trnaslation for my red tent and my human ecology school called casa cristal saraswati.