The mod adds inventory parts, that could be placed in other inventories.
It is possible because the parts could be inflated and deflated, and in the deflated state it's not an inventory, but just a cargo part.
The parts in the mod are configs that reuses Deployable Habitation parts from the SSPXr.
Parts have DeployableInventoryModule and stock ModuleCargoPart in the config, that will make less problems with mods like KSP Part Volumes.
Depends: StationPartsExpansionRedux, ModuleManager Recommended mod: ksp-part-volumes
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