Something that has exploded in popularity across the world lately is the beer growler, traditionally this was any container that you could fill from the local pub / bar so you could take beer with you. A "growler runner" was a boy who would fill a bunch of metal bucket with beer from the pub and bring them to work sites for labourers to drink with lunch (those were the good ol' days!).
The beer growler is supposedly named after the sounds of the beer carbonation rattling the lids of the buckets as the runner carried them (although in this image the buckets have no lids) but may have also been the sound of the workers grumbling bellies as they waited for their beery lunch!