and any open container without a lid tied on it is unclean.
Numbers 19:15 In-Context
If they fail to purify themselves after touching a human corpse, they defile the LORD’s tabernacle. They must be cut off from Israel. Because the water of cleansing has not been sprinkled on them, they are unclean; their uncleanness remains on them.
“This is the law that applies when a person dies in a tent: Anyone who enters the tent and anyone who is in it will be unclean for seven days,
and every open container without a lid fastened on it will be unclean.
“Anyone out in the open who touches someone who has been killed with a sword or someone who has died a natural death, or anyone who touches a human bone or a grave, will be unclean for seven days.
“For the unclean person, put some ashes from the burned purification offering into a jar and pour fresh water over them.