This satchel has a mission patch from Gemini 3, the flight of NASA astronaut Gus Grissom and John Young into Earth orbit in March 1965. The unofficial mission patch design is one that was created retroactively, after the first official mission patch was designed and used by the crew of Gemini V in August 1965.
This space-themed bag was collected by Nancy Yasecko, a filmmaker who grew up in Florida near Cape Canaveral, and whose film "Growing Up with Rockets," released in 1985, is a personal memoir of growing up in the shadow of the United States' civil human spaceflight program. The bag is part of a collection of artifacts that Yasecko donated to the Museum in 2012 along with a copy of the film, which is held by the Museum's film archives.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.