It depends on its cross section.
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First, fill up the 5 gallon bucket. Then, pour the contents in the 5 gallon bucket into the 3 gallon bucket. This leaves 2 gallons left in the 5 gallon bucket. Pour the 2 gallons into the 3rd container. Now, fill the 5 gallon bucket again and pour the full 5 gallons into the 3rd container. This gives you 7 gallons.
If filled, 2 gallons.
7 bucket 3bucket 0 3 3 0 3 3 6 0 6 3 7 2 0 2 2 0 2 3 5 0
Depends on how big the bucket is.
Volume is the measure of space. A 5 gallon bucket is roughly 1152 cubic inches.