Quite possibly 512 cubic inches!
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0.116 pounds per cubic inch
1 US gallon of water weighs 8.33 pounds at 60 degrees F. There are 231 cubic inches of water per gallon, so 8.33 pounds divided by 231 = .03606--> pounds per cubic inch.
259200 cubic inches or precisely 150 cubic feet
15 cubic inches = 0.00868 cubic feet.
It holds 702 cubic feet.