Definitely interested to hear about this - any more details or estimated date of availability?What growler designs do you have? We have a new device for filling bottles and some growlers but due to the large number of neck sizes on growlers it's hard to make the filler work on all growlers.
Will it use a screw-in lid? If so the vast majority of growlers are the same size (as are most squealers). Otherwise you can use a tapered silicon bung to accommodate varying diameters. Personally I'd prefer the common growler threaded cap; but the ability to switch out different-sized threaded caps or bungs would be cool if that's possible.