Twin Pack Folding Bucket

These water buckets are pretty cool. I got a set last go around and put them in my “emergency locker”. They store flat but I keep them in the box. I pulled them out, filled them up and carried them around to make sure they didn’t leak (outside of course). They fold back up (you sorta twist them closed)and store back in the box.

What’s the capacity of these buckets, please?

Please note the capacity is approximately 3 Gallons.