It's about twenty times as heavy as a Battery (D)
In other words, 0.00000000290 megatonnes is 21.50 times the weight of a Battery (D), and the weight of a Battery (D) is 0.0465 times that amount.(Alkaline)
A "D" size battery weighs 0.0000000001350 megatonnes. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about one-twenty-fifth as heavy as a Beer Keg
In other words, 0.00000000290 megatonnes is 0.03983 times the weight of a Beer Keg, and the weight of a Beer Keg is 25.110 times that amount.(for US half-barrel, full keg; draft beer; including keg itself, stainless steel)
A typical, half-barrel beer keg weighs 0.00000007280 megatonnes when full. A keg of this size contains 15.5 gallons of beer, or the equivalent of 6.8 cases.
It's about one-thirtieth as heavy as a Kangaroo
In other words, the weight of a Kangaroo is 29 times 0.00000000290 megatonnes.(for red kangaroo, Macropus rufus) (adult, male)
An adult, male red kangaroo weighs up to 0.0000000850 megatonnes. Fantastic jumpers, red kangaroos can leap horizontally 9 m (30 ft) and vertically 3 m (9 ft) in a single bound.
It's about thirty times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.032 times 0.00000000290 megatonnes.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.0000000000940 megatonnes. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 0.000000230 megatonnes.
It's about 45 times as heavy as a Battery (C)
In other words, the weight of a Battery (C) is 0.022 times 0.00000000290 megatonnes.(Alkaline)
A "C" size battery weighs 0.0000000000650 megatonnes. C batteries are typically used in medium-drain devices such as musical instruments.
It's about 50 times as heavy as a Tennis Ball
In other words, 0.00000000290 megatonnes is 50.30 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.0199 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00000000005770 megatonnes. 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 one-fifty-fifth as heavy as a Panda Bear
In other words, the weight of a Panda Bear is 53 times 0.00000000290 megatonnes.(a.k.a. Giant Panda, Ailuropoda melanoleuca)(Adult, male)
An adult, male Giant Panda weighs up to 0.000000150 megatonnes. Despite having the digestive system of a carnivore, the panda eats only bamboo and must eat up to 0.00000000640 megatonnes of it per day to compensate for the limited energy the plant provides.