A SpaceX Falcon 9 rocket is about to carry what will soon become the International Space Station’s first privately-built airlock.

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The company has previously built standardized boxes for space-based experiments and tiny satellite deployers, The Verge reports.

The Bishop is shaped like a bell jar and attaches itself to the outside of the space station using a number of clamps and latches.

“Once it’s there, it’s just extra real estate until we want to use it,” Mike Lewis, Nanoracks’ chief innovation officer, told The Verge. “We can use it in a number of ways, the first of which is to bring things outside.”