§ 1818 Exchange Deposit Obligations

• •A deposit for exchange means you get back something of the same kind.
• •The person holding it can't keep or return a different type of item.
• •It only applies when the agreement is to swap one thing for another of the same kind.

You leave a bag of flour at a friend's store and ask them to keep it safe, promising to give back a bag of flour later.

The store must return a bag of flour, not a different item like sugar, because the deposit is for exchange and must be the same kind of thing.