What most companies have worked out is that we all have heavy days and then hopefully the lighter days towards the end of our period. Rather cleverly they have mostly invented packs for a flow for a period. So by buying Heavy flow / night time pads alongside medium flow / panty liners it can make for the right balance. You know your period better than anyone else. I have a nightmare in the first few days and can hate how often i need to change my pads when out and about. Each of the kits mentioned above come with wet/dry zip bags. I will come to that in a minute as it is a lot less gross than you might be thinking.