I have several boxes of 4 liter (1 liter = 1000 cm2 vs 1 quart = 946 cm2)
Amber glass jugs, this boxes are double wall cardboard and hold of 4 jugs
They will will allow you to stack them up to 4 or 5 boxes high.
(See box certificate picture)
So a 5 boxes stack will store 20 gallons of...