Assuming the box is a cube then the box would be approximately 3 feet, 11 inches on each side.
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60 cubic cm
Cubic feet is a measure of volume (i.e. a cube measuring one foot x one foot x one foot). Pounds is a measure of weight (mass). Therefore the relationship between cubic feet and pounds is called density (lbs per cubic foot) and will vary for each substance: a gas (at atmospheric pressure) will have less than one pound per cubic foot, while a block of wood will have a density of approximately 60 lbs per cubic foot.
Figure about 1/2 cubic foot per 60 lb bag. The basic formula is to use equal amounts of cement, sand, and gravel. There are 27 cubic yards per cubic foot. It depends upon how thick you are planning to pour the concrete. For one foot thick, you would need 9 cubic feet of concrete. For 6" thick, you would need 4 1/2 cubic feet. I'll give you the answers for 1 ft thick and for 6" thick. For 1 foot thick, you need 9 cubic feet at 1/2 cubic foot per 60 lb bag equals 18-60 lb bags. That's six 60 lb bags of concrete, plus six 60 lb bags of sand, plus 360 lbs of gravel. For 6 inches thick, divide each of these by 2 to give 3-60 lb bags of concrete, 3-60 lb bags of sand, plus 180 lbs of gravel.
Roughly about 30 pounds per cubic foot, so 2 cu ft is about 60 pounds
60 cubic feet