[dylan604]

autonomous droid ships like the SpaceX capsule resupplying the ISS. You just modify the capsule so the hatch is the size of the container(s) inside like a cargo plane. The capsule docks, containers unload, capsule detaches and heads home. Next human ship docks, loads containers, detaches, continues mission.

seems simple enough

[karmicthreat]

Except that seems risky as hell. Much better to have everything aboard ahead of time instead of hoping everything goes right with a en-route logistics chain.