Zippered pouches like these ones allowed astronauts to secure equipment inside the spacecraft during the mission. According to the printing on this pouch, it was used to store film magazines for the Maurer 70mm camera during Gemini X. 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 used 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.