Alternatively an experimental mod on existing cargo racks.I'd have given them a trade-off. All sizes available, but each corrosion-resistant one would hold only half the tonnage of a regular one.
I can't imagine who thought it would be a good idea to create such a tightly limited CG reward that would then serve as a massive buff to completing the next CG. Would have been far better to use this CG as the tech-broker unlock.