This is a pouch used during the Gemini program to hold two blood pressure cuff bulbs. There is no evidence this artifact flew on a mission, but ones like it would have been used during the program. Astronauts needed to constantly monitor and record their vital signs so doctors on Earth could ensure their health was not compromised by being in space. Because of the microgravity environment of space, pieces of small equipment needed to be put in easily accessible and secure pouches so the they did not float freely and get in the way of the astronauts.
NASA transferred this pouch to the Museum in 1968.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.