Pinnon Hatch Farms egg-hatching bags are made of a strong, stretchable, lightweight mesh perfect for pedigree egg-hatching. Each bag holds up to a dozen eggs to separate your eggs by breed or breeding line during the hatching process. This is a simple inexpensive solution for egg hatching. Close the open end of the bag with a knot. These extra stretchy bags ensure chicks have plenty of room while hatching. Returns may be subject to a 20% restocking fee.