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Wiktionary
money bag

alt. 1 A bag, normally with a drawstring, used for holding money. 2 (context in the plural English) A wealthy person. n. 1 A bag, normally with a drawstring, used for holding money. 2 (context in the plural English) A wealthy person.

Wikipedia
Money bag

A money bag (moneybag, bag of money, money sack, sack of money, bag of gold, gold bag, sack of gold, etc.) is a bag (normally with a drawstring) of money (or gold) used to hold and transport coins and banknotes from/to a mint, bank, ATM, vending machine, business, or other institution. Money bags are usually transported in an armored car or a money train and, in the past, via stagecoach.

Crumillospongia is a genus of middle Cambrian sponge named after its similarity to a small leathery money purse, or crumilla (Latin for "small, little purse").