Abstract: A bottom fill airbag that is adapted so that inflation gas is channeled to the bottom of the airbag, causing the bottom portion of the airbag to initially inflate, then subsequently and progressively filling the entire airbag chambers from the lower portions upward to the top of the airbag. The bottom fill side airbag may include one or a plurality of channels that direct inflation gas from an inflator down to lower portions of the airbag. The inflation gas subsequently and progressively fills airbag chambers, starting from the bottom of the airbag and moving upwards inside of the airbag.