The stomach has quite the storage capacity, and can change its volume from 1 liter to 4 liters depending on how full it is.
Its acid is so strong that it can dissolve not only your dinner but also some metals.
To protect itself from self-digesting, the stomach has a few layers, each of them plays a critical role, and every 2 weeks the tiny lining layer gets totally regenerated.
On an empty stomach, the acidity of the gastric juices is so high that it can dissolve synthetic plastic.