Eco Period Cup 12 hour protection With Eco Period Cup you can swim, hike, cycle, do yoga and sleep through the night knowing that you are covered for up to 12 hours of leak-free continuous use. We do recommend emptying closer to 8 hours if you can, but you can rest assured it is safe to leave it in for up to 12 hours. One Eco Period Cup can collect the equivalent of 4 tampons-worth of menstrual flow, which means less trips to the bathroom and more peace of mind. Better for your body There is no law in Australia that requires tampon manufacturers to disclose their ingredients. But our menstrual cup is different. It’s made of just one thing: medical grade silicone—the same material as baby pacifiers/ dummies.