The hole or slit is an air release port that opens when the compartment is filled.
When the compartment fills, the slit opens, and excess air vents out. It prevents overinflation or rupture of the compartment.
The hole or slit is an air release port that opens when the compartment is filled.
When the compartment fills, the slit opens, and excess air vents out. It prevents overinflation or rupture of the compartment.