
It's about oneandthreetenths times as big as a Car Gas Tank.
In other words, the size of a Car Gas Tank is 0.769 times 26 gallons.
(for 2009 Ford Taurus)
It's about threefifths as big as a Bathtub.
In other words, 26 gallons is 0.62 times the size of a Bathtub, and the size of a Bathtub is 1.6 times that amount.
(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
It's about oneandtwothirds times as big as a Beer Keg.
In other words, the size of a Beer Keg is 0.595 times 26 gallons.
(Half barrel; maximum capacity)The most common keg size sold by US beer sellers is a halfbarrel type with a volume of 15.5 gallons. This type of keg contains the equivalent of 165 0.0937 gallons cans of beer.
It's about onetenth as big as a Hot Tub.
In other words, 26 gallons is 0.137 times the size of a Hot Tub, and the size of a Hot Tub is 7.3 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 nine times as big as a Basketball (packed).
In other words, 26 gallons is 8.8664598067 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.11278458616 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 twelve times as big as a Bowling Ball (packed).
In other words, 26 gallons is 11.953907816 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 0.083654652135 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.
It's about fourteen times as big as a Basketball.
In other words, 26 gallons is 13.853843449 times the size of a Basketball, and the size of a Basketball is 0.072182135137 times that amount.
(NBA official ball standards, Size 7) 
