Diva cup...HOW???

Ok so I have super heavy periods and it just baffles me when I hear people talk about these damn diva cups. I'll go thru an over night infinity pad in about 2hrs along with massive clots so it's like how can all that fit in a cup? I know y'all say we don't bleed as much as we think but seriously I've had some clots big enough to fill that cup even on my light days. I need to know there's some people out there that have not been able to use a diva cup due to heavy flows cuz this just seem unbelievable lol