Just found these milk-carton take home beer 'growlers' made by a company in the UK:
I presume they'd be OK for UK-hand-pulled ale and such, but most local beer (even at micros) is fairly highly carbonated and I can't imagine the cartons holding any pressure at all, but still ... and interesting idea.

I presume they'd be OK for UK-hand-pulled ale and such, but most local beer (even at micros) is fairly highly carbonated and I can't imagine the cartons holding any pressure at all, but still ... and interesting idea.