This page shows the different variations of the Żołądek from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
The stomach is somewhat shaped like a bag, tapering down to a tube like exit, there is also a tube almost on top that appears to come from another part of the body. The stomach is sitting in a somewhat reclining position.