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An Apollo Fecal Containment Bag.

The accompanying sign reads

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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 command module.

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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.