In the context of cannabis consumption devices, the bowl refers to the receptacle or compartment in a pipe, bong, bubbler, or other smoking apparatus that actually holds the ground cannabis flower. Bowls are often removable to allow easy dumping of ash and cleaning after use. Packing a bowl refers to filling the empty bowl with broken-up bud before smoking. Ideal bowl size varies depending on factors like the number of people sharing. Bowls designed for group use tend to be larger in diameter to hold more flower. Cannabis bowls often contain small holes at the bottom to allow airflow while smoking. But screening or lining bowls prevents bits of ground material from being inhaled. Proper etiquette when sharing a bowl usually involves cornering or lighting just a portion rather than the entire surface area to evenly burn the weed.