An Apollo Fecal Containment Bag.
The accompanying sign reads
Apollo Fecal Containment Bag
This bag was used for the collection of feces. The collection bag was rolled
up and placed in a drawer located on the right wall equipment bay of the
The "Waste Management
System" chapter of the Biomedical Results of
Apollo contains a detached, scientific description (in typical
NASAese) of how the UCTA worked, while this
interview with Rusty Schweickart gives a more, um, "candid" description
of its use.