I have aquired 12 TAD bottles and I'll never use them all for serving beer. I was curious about using them to ferment small 1 gallon test batches. Does anyone see an issue with this? The only one I could really think of is that they are fairly dark and hard to see into so racking would have to be done carefully so as not to suck up any trub. Well...one other thing is that they are 6L (1.59 gallons) in size so I'm not sure if that would be enough headspace for a 1 gallon batch.