It's about three-tenths as big as a Concrete Mixer Truck.
In other words, 391 pecks is 0.310 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 3.20 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)
A concrete mixer truck has a drum volume of up to 1,200 pecks. Concrete mixer trucks can be in transit for about 90 minutes before the concrete dries — if the concrete dries while in the drum, jackhammers or even dynamite must be used to remove it.
It's about five times as big as a Hot Tub.
In other words, 391 pecks is 4.790 times the size of a Hot Tub, and the size of a Hot Tub is 0.2090 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)
An average, four-person hot tub holds 81.60 pecks of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about twenty times as big as a Bathtub.
In other words, the size of a Bathtub is 0.045 times 391 pecks.(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
The capacity of a typical bathtub is 18 pecks. Historically, bathtubs have been made of various materials including marble, terracotta, silver, gold, and iron but the size and shape of the tubs has changed little in their 7,000 year history.
It's about 45 times as big as a Car Gas Tank.
In other words, 391 pecks is 45.50 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.022 times that amount.(for 2009 Ford Taurus)
A car gas tank (for example, that of a 2009 Ford Taurus) holds 8.590 pecks of gas. In contrast, the Curved Dash Oldsmobile — the first mass-produced car — had a fuel capacity of just 2.270 pecks.
It's about 60 times as big as a Beer Keg.
In other words, 391 pecks is 58.70 times the size of a Beer Keg, and the size of a Beer Keg is 0.017 times that amount.(Half barrel; maximum capacity)
The most common keg size sold by US beer sellers is a half-barrel type with a volume of 6.660 pecks. This type of keg contains the equivalent of 165 0.0403 pecks cans of beer.
It's about 300 times as big as a Basketball (packed).
In other words, 391 pecks is 310.31657870 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.0032225155491 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 0.806402290990 pecks. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 400 times as big as a Bowling Ball (packed).
In other words, 391 pecks is 418.373945890 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 0.0023902062015 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 0.598125199850 pecks. 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.