Wetbags and Pail Liners are used to store your dirty diapers. They are all waterproof and machine washable. A wetbag is small bag that is used when you are out and about. Either inside your diaper bag, or in addition to your diaper bag. A pail liner is used to store your dirty diapers for 1-3 days, in between washes. Pail Liners line most garbage cans or can either be hung on the back of a door or door knob. Using a pail liner makes laundry day so much easier! It is much easier to turn our pail liner (and wetbag) inside out and toss it into the wash, rather than have to clean out a large 14 gallon can! Most people find it beneficial to have 2 pail liners, so while one is in the wash, you have a place to put the new dirty diapers you've accumulated. We also recommend at least two wetbags, especially if you're the type of person that is out and about several times a week! Unsure of what you need? Please ask! :)