An apparatus for use in a stomach of a subject includes a balloon adapted for placement in the stomach and having an opening to an interior of the balloon, an internal tube in the interior of the balloon with a proximal end coupled to the opening of the balloon, and an inflation tube. The inflation tube has a distal end in the interior of the balloon and a proximal end that can receive a fluid on an exterior of the balloon. The inflation tube can stretch from the stomach to a mouth of the subject to facilitate inflation of the balloon and has a resting position that is substantially within the interior of the balloon. The internal tube is disposed around at least a portion of the inflation tube that is in the interior of the balloon.
