International Standard Payload Rack

The International Standard Payload Rack (ISPR) is a steel framework container that is designed and been adopted by the International Space Station (ISS) program to support efficient integration and interchangeability of space payload hardware, such as machines and experiments.

Each ISPR provides 1.571 m3 (55.5 cu ft) of internal volume being about 2 m (79 in) high, 1.05 m (41 in) wide, and 85.9 cm (33.8 in) deep.

Tracks on the exterior front posts allow mounting of payload equipment and laptop computers.

[citation needed] The International Standard Payload Rack are the size of a side-by-side refrigerator, and is too big to fit through the Russian probe and drogue docking system, APAS, or NDS docking systems, and therefore cannot be transferred directly from a Progress, ATV, or the interior of the Space Shuttle to the ISS.

[2][citation needed] In the past ISPRs were delivered in Multi-Purpose Logistics Modules, which were carried in the Space Shuttle cargo bay and berthed to CBM ports.