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How big is 300 cubic inches?

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It's about as big as The Blood in a Human Body
(for 70 kg body; average altitude; average)
The volume of blood in the average human body is about 300 cubic inches. Persons living at high altitude, however, may have up to an additional 100 cubic inches of blood to compensate for the lower oxygen level.
It's about nine-tenths as big as a Bowling Ball
In other words, 300 cubic inches is 0.932966082040 times the size of a Bowling Ball, and the size of a Bowling Ball is 1.0718503269 times that amount.
(USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 321.555098060 cubic inches. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about seven-tenths as big as a Basketball
In other words, 300 cubic inches is 0.692000172260 times the size of a Basketball, and the size of a Basketball is 1.44508634550 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 433.525903650 cubic inches. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
It's about three-fifths as big as a Bowling Ball (packed)
In other words, 300 cubic inches is 0.59709829250 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 1.67476613580 times that amount.
(64% packing density) (USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 321.555098060 cubic inches. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about two times as big as a Human Stomach
In other words, the size of a Human Stomach is 0.50 times 300 cubic inches.
(human; adult)
An average adult human stomach has a volume of about 100 cubic inches. A newborn baby has a stomach capacity of just 2 cubic inches.
It's about two-fifths as big as a Basketball (packed)
In other words, 300 cubic inches is 0.442880110230 times the size of a Basketball (packed), and the size of a Basketball (packed) is 2.25794741490 times that amount.
(64% packing density) (NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball measures about 433.525903650 cubic inches. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about three times as big as an Ostrich Egg
In other words, 300 cubic inches is 3.012 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 0.3320 times that amount.
(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 97.640 cubic inches in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.