Abstract: A one-way valve is formed by connecting a third layer of a polymeric film to one of two film layers that are sealed about the perimeter to form an inflatable member. A series of spaced seals connect the third layer so as to form a serpentine flow path across the inflatable member. The serpentine flow path communicates at one end with an inlet and at an opposite end with an outlet in communication with an interior of the inflatable member. Inflation pressure within the inflatable member forces together the adjacent film layers forming the one-way valve so as to maintain the inflatable member in an inflated state.