What is the meaning of pouch?

noun

• A small or medium size container for holding or carrying things.
• An enclosed space.
  • usage: "the trapped miners found a pocket of air"
  • synonyms: sac, sack, pocket
• Anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican. ()
  • synonyms: pocket

verb

• Put into a small bag.
• Send by special mail that goes through diplomatic channels.
• Swell or protrude outwards.
  • usage: "His stomach bulged after the huge meal"
  • synonyms: bulge, protrude