Menstrual cups are the most low-cost menstrual product so far. Our cup is made of 100% Medical Grade Silicone. They are supposed to be inserted into your vagina. It can collect up to 26 ml of blood and it doesn t leak out. On average, we bleed just about 20 ml a day and the cup has the storing capacity of a minimum of 16 ml of blood depending on the size of the cup. You can be completely at ease and check on the cup once in 8 hours. There's absolutely no need to remove it while peeing or while doing absolutely anything else including swimming. Once you go cup, you always go yup!