Smokebuddy purifiers come in Junior, Original and Mega forms, the difference being the size and the lifespan of the filter. The "Junior" is perfect for purses, pockets, backpacks or coats, and has a lifespan of 150+ uses. The "Original" (and best-selling) is great for dorm rooms, automobiles, travel and more, with a lifespan exceeding 300 uses. The monster of them all, the "Mega," is a beast, suited for the serious consumer. It's great for apartments, dorm halls or suites, even a football team, and designed to last as long as your lungs will (give or take.) The affordable, long-lasting filter is made from Post-Consumer Recycled Plastic (PCR) and can be recycled once the filter lifespans expires.