Draft Brewer Stackable Cannonball Stainless Steel 1.75 Gallon Mini Ball Lock Keg System For Small Batch HomeBrewing Beer Brewing The first mini keg system that packs the power of a taproom into a portable, compact 1.75 gallon barrel Barely bigger than a milk jug, it slides straight onto a fridge shelf, pops in a cooler or drops right into your trunk Cannonball kegs are easily stackable once disconnects have been attached. The Cannonball is the party-powering ammunition you need to have a good time, anytime and anywhere. Artillery for the small batch brewer. Carbonate homebrew in minutes, not weeks. Real-time carbonation control. A quick pressure adjustment and youre instantly pouring perfect pints.