A knee-bag module includes a knee-bag to be inflated in front of a leg portion of a vehicle occupant and an inflator for ejecting gas from a gas outlet thereof to inflate the knee-bag. A plurality of bail elements are mounted at spaced apart locations along the overhead support member, and each bail element includes a partition element which extends substantially transversely of the overhead support member at an angle \u03b1 of approximately 78. When a triglyceride is used as a reactant, glycerol and fatty acids are generated in situ by an interesterification reaction.