Pad ideas Hacks invention

I had a girlfriend who sometimes used two pads at once, one on top of the other. When I asked why, she said doing this held the top pad more closely against her vulva. I guess she thought it reduced the possibility that her flow would run off the end of the pad, rather than being absorbed. My g/f was a teacher, so she could only go to the toilet in breaks between classes. So her plan was to prevent overflow, rather than collecting it with a second pad, as shown in the video.