That's going to depend on its shape, and on how deep it is.
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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.
Volume is the measure of space. A 5 gallon bucket is roughly 1152 cubic inches.
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5 gallons of concrete will fit.
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