It's about one-fiftieth as heavy as a Pig
In other words, 5 kilograms is 0.0 times the weight of a Pig, and the weight of a Pig is 50 times that amount.(Domestic pig, Sus scrofa domesticus, a.k.a. S. domesticus) (adult)
Domestic pigs weigh between 50 kg and 450 kg. The titular character "Babe the pig" in the 1995 family film was played by 48 different American Yorkshire piglets due to the length of filming and the rate at which piglets reach adulthood.
It's about 55 times as heavy as a Deck of Cards
In other words, 5 kilograms is 53 times the weight of a Deck of Cards, and the weight of a Deck of Cards is 0.02 times that amount.(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 0.094 kilograms. 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 272 kg.
It's about 75 times as heavy as a Battery (C)
In other words, 5 kilograms is 77 times the weight of a Battery (C), and the weight of a Battery (C) is 0.01 times that amount.(Alkaline)
A "C" size battery weighs 0.065 kilograms. C batteries are typically used in medium-drain devices such as musical instruments.
It's about one-eighty-fifth as heavy as a Horse
In other words, 5 kilograms is 0.01 times the weight of a Horse, and the weight of a Horse is 83 times that amount.(Equus ferus caballus) (Arabian, adult)
n Arabian riding horse (or similar breed) weighs between 380 and 450 kg. During races, horses must carry jockeys and their equipment, which in the Kentucky Derby, for example, can weigh up to 54.4 kg.
It's about 85 times as heavy as a Tennis Ball
In other words, 5 kilograms is 86.7 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.012 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.0577 kilograms. 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-ninetieth as heavy as a Grand Piano
In other words, 5 kilograms is 0.01 times the weight of a Grand Piano, and the weight of a Grand Piano is 91 times that amount.(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 450 kg. Well-made pianos such as this may last 75 to 100 years.
It's about one-one-hundredth as heavy as a Polar Bear
In other words, 5 kilograms is 0.0097 times the weight of a Polar Bear, and the weight of a Polar Bear is 103 times that amount.(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 352 and 680 kg. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.