Zippered pouches like this one allowed astronauts to secure equipment inside the spacecraft during the mission. According to the printing on the pouch, this one was used for a zodiacal light camera, one of the many experiment cameras flown in the Gemini program. In the weightless and cramped confines of an orbiting spacecraft, small objects need secure locations so as not to hinder the work of the astronauts when not being used. NASA also uses Velcro on small items for short term attachment to the inside of the spacecraft.
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.