It's about eight times as big as The Blood in a Human Body
In other words, 391 deciliters is 8 times the size of The Blood in a Human Body, and the size of The Blood in a Human Body is 0.1 times that amount.(for 70 kg body; average altitude; average)
The volume of blood in the average human body is about 50 deciliters. Persons living at high altitude, however, may have up to an additional 20 deciliters of blood to compensate for the lower oxygen level.
It's about one-twentieth as big as a Hot Tub
In other words, 391 deciliters is 0.054 times the size of a Hot Tub, and the size of a Hot Tub is 18.4 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)
An average, four-person hot tub holds 7,190 deciliters of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about twenty times as big as a Human Stomach
It's about twenty times as big as an Ostrich Egg
In other words, 391 deciliters is 23.96 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 0.0417 times that amount.(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 16 deciliters in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.
It's about 65 times as big as a STARBUCKS Venti Coffee
In other words, 391 deciliters is 66 times the size of a STARBUCKS Venti Coffee, and the size of a STARBUCKS Venti Coffee is 0.02 times that amount.A STARBUCKS Venti coffee drink measures 5.90 deciliters. The name of the size, Venti, is the Italian word for twenty.
It's about 80 times as big as a Blood Donation
In other words, 391 deciliters is 80 times the size of a Blood Donation, and the size of a Blood Donation is 0.0 times that amount.(American Red Cross donation volume)
The typical donation amount when giving blood is about 5 deciliters. Donated quantities of blood typically have a viable shelf life of about 42 days.
It's about 100 times as big as a Baseball (packed)
In other words, 391 deciliters is 118.94975 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.008406911 times that amount.(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 2.0173334 deciliters and 2.19015750 deciliters. A major league pitcher can throw a fastball at up to 150 kph (91 mph).