These disposable masks are three layers with elastic ear loops. The CDC recommends that people wear masks in public settings, especially when other social distancing measures are difficult to maintain to reduce the spread of COVID-19. This pack contains 50 masks so you will need to order a total of 2 packs for a 100 bag packing event and 10 packs for a 500 bag packing event. You may also want to consider ordering extra masks for packers if needed.