Tools of the Trade: Ground Glass Stoppered Bottles

I truly adore ground glass stoppered bottles.  The good ones have a tight secure fit and don't let air escape.  I collect antique ones for their visual beauty but actually use them quite a bit.  Stronger scented potions tend to ruin good phenolic caps forcing me to toss them into the rubbish (where they end up in landfill).  Here are some gorgeous examples.