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How big is 21.70 cubic inches?

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It's about one-and-one-tenth times as big as a Baseball (packed)
In other words, 21.70 cubic inches is 1.0818017 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.924383830 times that amount.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 12.3105240 cubic inches and 13.3651610 cubic inches. A major league pitcher can throw a fastball at up to 150 kph (91 mph).
It's about seven-tenths as big as a Blood Donation
In other words, the size of a Blood Donation is 1 times 21.70 cubic inches.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 30 cubic inches. Donated quantities of blood typically have a viable shelf life of about 42 days.
It's about three-fifths as big as a STARBUCKS Venti Coffee
In other words, the size of a STARBUCKS Venti Coffee is 1.70 times 21.70 cubic inches.
A STARBUCKS Venti coffee drink measures 36 cubic inches. The name of the size, Venti, is the Italian word for twenty.
It's about one-and-seven-tenths times as big as a Baseball
In other words, 21.70 cubic inches is 1.6903151720 times the size of a Baseball, and the size of a Baseball is 0.59160564640 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 12.310523810 cubic inches and 13.365161240 cubic inches. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
It's about two-and-a-half times as big as a Tennis Ball
In other words, 21.70 cubic inches is 2.2580 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.44290 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must measure 6.54 cm to 6.86 cm in diameter, for a total volume of 9.6110 cubic inches. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about three times as big as a Puck (Hockey)
In other words, 21.70 cubic inches is 3.069922014 times the size of a Puck (Hockey), and the size of a Puck (Hockey) is 0.32574117370 times that amount.
(Ice hockey)
standard ice hockey puck measures about 7.068583469 cubic inches. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about one-fifth as big as an Ostrich Egg
In other words, 21.70 cubic inches is 0.21790 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 4.5890 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.