What cup do you use? - Mooncup

Why? My sister had one and recommended it

Do you have multiple sizes, or just a medium / large one that you change more often during heavier flow? Just one, just change more frequently as necessary

What on earth do you do if you need to change it in a public bathroom or at work? I often don't have to, but if I do I just empty and wipe with loo roll, if I have a bottle of water on me I rinse with that.

How long do they last (as in years)? Mine is probably about 4 years old I think.

Do they come with a storage case, so you can pop it in your bag in case of surprise periods? Mine didn't come with a case, but I don't tend to be surprised these days anyway.

Can you wear them overnight (as long as you're sleeping less than the 10 hours allowed)? Yes I always wear overnight - is there a 10 hour limit? I have never worried about such a thing.

What is great - environmentally they are very friendly, and also so so so cheap compared with anything else, and comfortable I think too - much more comfortable than tampons.