Perhaps you've heard of micro-breweries? Here in the Lalorium, we've scaled down micro-brewing to nano-brewing (for which we have a selection of 25L carboys), pico-brewing (in an array of 5L demijohns), and now femto-brewing, for experimental-to-the-point-of-possibly-undrinkable ferments, like the liquorice and the rose-hip and gentian porters below.
The brewing supplies stores round these parts, many and excellent though they are, don't seem to stock a vessel suitable for the hemi-demi-semi brew. For three months, therefore, Tim has been begging everyone he knows to take up bulk fruit-juice consumption and to sling us the empties. As for the airlocks, they're single use only.