In one sentence, describe what the following article is about:

Make sure that you have products that work for your light days and your heavy days. You want to be prepared for any stage of your period. Sanitary napkins and tampons take a long time to expire as long as they are stored in a cool, dry place, so it is okay for you to have several extra boxes in your home. Sanitary napkins and tampons can be ruined by moisture. Moisture can ruin the wrappers and make the products unhygienic. Look for waterproof bags where you can store your period supplies safely. An opaque bag will allow you to walk to the bathroom without showing off your period supplies to your classmates. If you cannot find an opaque waterproof bag, consider doubling up. Place a small,clear, waterproof plastic bag inside a small opaque bag. You will get the waterproofing benefits as well as your desired privacy. Most schools and public bathrooms will only supply a coin-operated tampon and sanitary napkin dispenser. Hold on to extra change in case you need to use one of these dispensers in an emergency. A few schools, however, are starting to provide free menstrual products for their students. Place 3-5 tampons or sanitary napkins along with a few coins inside each waterproof bag. Make sure that you include tampons or pads for both lighter and heavier flow days. These kits will not see you through an entire period, but they will see you through a full day at work or school, and you can always restock them at home. Take a few minutes to think about good places where you might stash a few extra sanitary napkins or tampons. Some good places to store emergency period supplies include:  Your backpack or gym bag. Your favorite handbags. Your desk drawer at work. Your locker at school. Your locker at the gym. Remember to refresh your period supplies each month. Periods can sometimes be unpredictable, so you will want to be prepared and have period supplies handy. Even if you do not end up using your emergency period kits, you might have friends who will be grateful that you were so well prepared. Not everyone has access to a large locker or private office to store clothing. But if you are lucky enough to have a place to store clothes, have an extra pair of clean underwear and clean pants or leggings available. If your period leaks at work or school, you will be able to change discreetly.

Summary:
Buy extra boxes of your favorite period products. Purchase several opaque waterproof bags. Hang on to extra pocket change. Assemble several period kits. Stash your period kits at home, work, and school. Refill your period kits as necessary. Keep extra underwear and leggings handy.