My best guess is that the (basketball-size) 'round

My best guess is that the (basketball-size) 'round bottom flask' in that photo is 5,000 ml (5 liters /or 1.32gals) in size. From the Google images I pulled-up on this , I saw a persons' hand grasping at 1,000 ml flask , which proportionate to his hand was approx the size of a cantaloupe...or approx. 4-to-5X less volume than that one from Nanoco you showed. Here's where I dug-up that reference: https://www.google.com/search?hl=en&biw=1...zhZOU2OzM:
*Here's a 5,000 ml flask on Amazon: https://www.amazon.com/MHB-LB40-5000-Boiling-...ullets-btf
*This may answer the container volume question , but without knowing how many 'grams' of QD's there are per 'ounce' in the liquid suspension , a reasonable estimate seems unattainable, to me anyway.