Not sure why there aren’t any pictures of this with a banana or any sort of item to help visualize the scale. All the reviews are mashed together and most are for the 40oz and 64oz size.
16 ounces = 1 pint
32 oz = 1 quart (1 liter = 5% more)
64 oz = 1/2 gallon (2 liters = 5% more)
128 oz = 1 gal (4 liters = 5% more)
84 oz = 1/2 gal + 1 pint + 4 oz, or 5 pints, 4 ounces
…or about 2.5 liters (compare to 3 liter soft drink bottle with rounded top/neck & bottom removed)