I don't know if this is a tip per se, but its something I do.
If I want to try using, say, guavas for the first time I make a gallon, no big deal. But if I really want to get crazy and make, say, celery mead, I use a cleaned 1 liter whiskey bottle.
I bought a bag of black party balloons at the party store, so now my improvised 1-liter batches look pretty punk rock. Lol.