48 on suit and ship and 24 on multi - tool Are you sure about the multi - tool? I have a 20 slot one now it has three empty slots so maybe 23. The starting multi - tool, the Experiment C6/4, has five inventory slots from mere five slots you start with at the beginning up to a maximum of 24. But how many total slots can your inventory contain and how many hold slots can you get in a ship? How many attachments can a multitool.