bank in a suitcase
n.— «In effect we have had to take our bank to them. To do this we have introduced portable branches as well as what is sometimes called the “bank in a suitcase”—a mobile device using advanced satellite technology that literally allows a bank account to be set in place under a tree!» —“Leading the Mzansi initiative” in Johannesburg Finance24 (Cape Town, South Africa) Sept. 7, 2005. (source: Double-Tongued Dictionary)