It's about three-fifths as big as an Ostrich Egg.
In other words, 1 liters is 0.6127 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 1.632 times that amount.(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 1.6 L in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.
It's about one-and-seven-tenths times as big as a STARBUCKS Venti Coffee.
In other words, the size of a STARBUCKS Venti Coffee is 0.59 times 1 liters.
It's about half as big as a Human Stomach.
It's about two times as big as a Blood Donation.
In other words, the size of a Blood Donation is 0.5 times 1 liters.(American Red Cross donation volume)
It's about three times as big as a Baseball (packed).
In other words, 1 liters is 3.0421931 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.32871023 times that amount.(64% packing density) (MLB rules)
It's about five times as big as a Baseball.
In other words, 1 liters is 4.753426751 times the size of a Baseball, and the size of a Baseball is 0.2103745471 times that amount.(MLB rules)
It's about one-fifth as big as The Blood in a Human Body.
In other words, the size of The Blood in a Human Body is 5 times 1 liters.(for 70 kg body; average altitude; average)