Adds toolbelt equipment for extra character inventory slots when you aren't playing with Space Age enabled. Still requires Space Age expansion to have been purchased.
In think this mod should be marked has space age content like all the other mod that add content from space age.
(you can/should add a space category to the mod).
I think that's done automatically by the mod portal - at least, I don't see an option to mark it manually as such. The mod has one of the space age feature flags set so it should require the space age DLC to use. Not sure why it isn't marked accordingly.