One of the best things about menstrual cups and menstrual discs is that they can frequently be worn for up to 12 hours. However, changing one tends to require water to rinse it out. If you think you'll need to change the reusable product prior to that 12-hour mark and won't be near a sink, consider the Softdisc Disposable Menstrual Discs ($11 for 14 disposable discs).