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How big is 398 gallons?

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It's about two times as big as a Hot Tub.
In other words, 398 gallons is 2.1 times the size of a Hot Tub, and the size of a Hot Tub is 0.476 times that amount.
(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
It's about one-tenth as big as a Concrete Mixer Truck.
In other words, 398 gallons is 0.14 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 7.1 times that amount.
(a.k.a. cement mixer, a.k.a. cement mixer truck, a.k.a. cement transport truck, a.k.a. concrete mixer, a.k.a. concrete transport truck, a.k.a. in-transit mixer)(standard size; drum capacity)
It's about nine-and-a-half times as big as a Bathtub.
In other words, the size of a Bathtub is 0.11 times 398 gallons.
(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
It's about twenty times as big as a Car Gas Tank.
In other words, 398 gallons is 19.9 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.0503 times that amount.
(for 2009 Ford Taurus)
It's about thirty times as big as a Beer Keg.
In other words, 398 gallons is 25.7 times the size of a Beer Keg, and the size of a Beer Keg is 0.0389 times that amount.
(Half barrel; maximum capacity)
It's about 150 times as big as a Basketball (packed).
In other words, 398 gallons is 135.72503858 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.0073678372868 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 1.8767355136 gallons. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 200 times as big as a Bowling Ball (packed).
In other words, 398 gallons is 182.98674272 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 0.0054648767727 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 1.3920134115 gallons. 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.