The present invention provides an intragastric volume-occupying device system, comprising a capsule configured to be swallowable by normal peristalsis and to degrade in a gastric environment. The system further comprises a volume-occupying component compacted and contained within the capsule, the volume-occupying component comprises a composite wall defining an outer surface and an interior cavity with an inner surface, a self-sealing valve system including a septum, and a deflation component including an erodible portion, a moisture absorbing expandable portion and an inlet port in fluid communication with the interior cavity. The system further comprises a catheter coupled to the valve system, the catheter comprising: a lumen in fluid communication with the interior cavity of the volume-occupying component, wherein the lumen is configured for filling the balloon interior cavity with an inflation fluid.