It's about three-fifths as big as a Concrete Mixer Truck
In other words, 729 pecks is 0.58 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 1.7 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 nine times as big as a Hot Tub
In other words, 729 pecks is 8.93 times the size of a Hot Tub, and the size of a Hot Tub is 0.112 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 40 times as big as a Bathtub
In other words, 729 pecks is 40 times the size of a Bathtub, and the size of a Bathtub is 0.03 times that amount.(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 85 times as big as a Car Gas Tank
In other words, 729 pecks is 84.8 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.012 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 100 times as big as a Beer Keg
In other words, 729 pecks is 109 times the size of a Beer Keg, and the size of a Beer Keg is 0.0092 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 one-three-hundred-fiftieth as big as a Hot Air Balloon
In other words, 729 pecks is 0.003 times the size of a Hot Air Balloon, and the size of a Hot Air Balloon is 340 times that amount.(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 250,000 pecks. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about one-four-hundredth as big as an Olympic Swimming Pool
In other words, 729 pecks is 0.003 times the size of an Olympic Swimming Pool, and the size of an Olympic Swimming Pool is 380 times that amount.(FINA regulation; (minimum capacity)
According to the Fédération Internationale de Natation (FINA), a swimming pool for Olympic and world championship events must measure 50 m by 25 m with a depth of at least 2 m for a total volume of 280,000 pecks. A pool of this size was to be used in Olympic time trials in New Jersey in early 2008, but its component pieces were stolen from a warehouse, likely to be sold for scrap metal.