It's about ten times as heavy as a Hamster
In other words, the weight of a Hamster is 0.10 times 0.00000000290 megatonnes.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.000000000200 megatonnes. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 0.0000000300 megatonnes of food in their borrows.
It's about one-tenth as heavy as a Dalmatian
In other words, 0.00000000290 megatonnes is 0.0983 times the weight of a Dalmatian, and the weight of a Dalmatian is 10.20 times that amount.(a.k.a. Dalmatinac, a.k.a. Carriage Dog, a.k.a. Spotted Coach Dog, a.k.a. Firehouse Dog) (FCI standard; male)
The Fédération Cynologique Internationale (FCI) calls for Dalmatians to weigh between 0.00000002950 megatonnes. The association of the breed with fire departments (and similarly with Budweiser Beer and its team of Clydesdales) stems from their affinity for horses, having been used historically as carriage dogs capable of guiding horse-drawn fire engines to the sites of blazes.
It's about one-fifteenth as heavy as a Toilet
In other words, the weight of a Toilet is 15 times 0.00000000290 megatonnes.(KOHLER Round front sitting flush toilet, model #K-11471-0)
The weight of a typical round front sitting flush toilet is 0.00000004360 megatonnes. The Indian town of Musiri in Tamil Nadu state features the world's only paying toilet, which rewards its users up to 10¢ Indian (10 paisas) per visit and uses the waste for compost and fertilizer.
It's about one-fifteenth as heavy as an Octopus
In other words, the weight of an Octopus is 17 times 0.00000000290 megatonnes.(for Giant Pacific Octopus, Enteroctopus) (Adult, average)
The adult North Pacific Giant Octopus usually weighs around 0.0000000500 megatonnes. It is the largest octopus species and is known for its considerable intelligence, including the ability to open jars, solve mazes, and mimic other octopuses.
It's about eighteen times as heavy as a Billiard Ball
In other words, 0.00000000290 megatonnes is 17.7903460267450 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.056210261368534 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about eighteen times as heavy as a Puck (Hockey)
In other words, 0.00000000290 megatonnes is 17.7903460267450 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.056210261368534 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about twenty times as heavy as a Baseball
In other words, 0.00000000290 megatonnes is 19.959900420250 times the weight of a Baseball, and the weight of a Baseball is 0.050100450350216 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.0000000001417476156250 megatonnes and 0.000000000148834996406250 megatonnes. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).