And AIS stacks on top of base storage.
At peak: $2.40 base + $6.90 AIS = $9.30 per cubic foot, same shelf, same month.
366-455 days: $6.90 or $0.30/unit, greater of.
2023: +$0.20/unit surcharge on all FBA fulfillment fees (April).
2024: surcharge removed - but base fees rose 3-5%.
Every temporary surcharge has stayed in the base.