From Longman Dictionary of Contemporary Englishpouchpouch /paʊtʃ/ noun [countable] 1 DCa small leather, cloth, or plastic bag that you can keep things in, and which is sometimes attached to a beltpouch of a leather pouch of tobacco a money pouch2 especially American English a large bag for carrying letters or papers a mail pouch3 a pocket in the side of a bag such as a rucksack4 
HBAa pocket of skin on the stomach which marsupials such as kangaroos use for carrying their babies5 HBAa fold of skin like a bag which animals such as hamsters or squirrels have inside each cheek to carry and store food
HBAa pocket of skin on the stomach which marsupials such as kangaroos use for carrying their babies5 HBAa fold of skin like a bag which animals such as hamsters or squirrels have inside each cheek to carry and store foodExamples from the Corpus
pouch• Three or four days before mating, the male develops a pouch on his belly.• a concealed pouch for your passport• Within five seconds, the female squirts several thousand eggs into his pouch and the two separate.• One patient with pelvic sepsis developed a pouch-vaginal fistula and ileoanal stenosis culminating in pouch excision.• With only two cartridges in their pouches and the last meal a memory of days, they had to.• Two pouches failed because of ischaemia but the clinical results in the remaining seven patients are indistinguishable from younger patients in the series.Origin pouch (1200-1300) Old North French pouche 