I'm Canadian and everything here is imperial or metric, so often I have to do the math before following instructions. Either way, If I make 20 Liter batches (5 gallons?), 6.5 gallons will provide plenty of head space (about 5.5 liters worth)
Thanks day_trippr, The images are exactly what I bought. Though now that I have them home I'm not sure it was such a great purchase. Buddy had white paint drops on the outside of the glass on one of them. Not really an issue, especially once I scrub off, but it kinda weirds me out that the containers used to make food (or drink), were stored somewhere where things were getting painted.