When pinched, the disc is only about 70mm wide, very similar in size to the average tampon. Vaginas are very elastic, and FLEX disc was designed specifically to comfortably fit inside the vaginal fornix. So, even though it might not look like it will fit, trust us (and Board Certified OBGYN, Dr. Jane van Dis), it was designed specifically with your anatomy in mind and is made to fit more than 95% of menstruating humans.
One of the first questions that we get from people when they see FLEX disc for the first time is “That’s huge! How in the world is that supposed to fit?”
Don’t worry, the disc is flexible (get it?) It was designed to be pinched in half when inserting.