Also, I'm really pleased that the width (I ordered the medium size) is almost the same as the Large Diva cup (I'm 28, and have had 2 kids). The Large Diva has always been too long for me, so I've been wearing it inside out ever since I started using a cup 2 years ago. I figured it was finally time for a new cup, or at least a backup. I'll use the Diva for my 1 really heavy flow day, and then use the MeLuna for my 6 days of spotting!
Here is a comparison of the MeLuna in Medium (and in orange, my favorite color!!) to the Large Diva, inside out. None of the sizing charts were helping me because they either did not include the MeLuna, or didn't include the dimensions of the Diva when worn inside out. So here it is, in case you were wondering.
The Medium MeLuna compared to the right side out Large Diva
Widths/circumferences are almost the same. The Large Diva is just a tiny bit bigger.
My cat had to get in my light box and inspect the cups.
Also, it fits wonderfully, although it is a little stiffer material than the Diva. I just filled it to the bottom of the rim with water and poured it into a little kids' medicine cup. It was just over 15mL.
There ya go! Hope that was helpful to anyone wondering about the MeLuna.