Abstract: A bag includes a first housing defining a first interior compartment and a second housing defining a second interior compartment. In a closed state of the bag, the second housing is configured to face the first housing, to be opposed to the first housing. In an open state of the bag, the second housing is configured to extend away from the first housing. The bag includes a first changing pad portion configured to be stored within the first interior compartment and a second changing pad portion configured to be stored within the second interior compartment. Covers of the first and second changing pad portions are configured to be exposed in the open state of the bag and to be isolated from an external environment in the closed state. The first and second housings are joined at a bottom portion of the bag.