Bottomless Bottle

The Bottomless Bottle is an opaque grayish bottle created with glass made from Space Sand. It can hold amounts of liquid far greater than it appears it should be able to, often hundreds, thousands, or even millions of times its apparent volume, all the while it will only weigh as much as it would if it were filled with a proportional fraction of the liquid. Liquid that enters in is compressed into the space and uncompressed when it leaves. An empty Bottomless can be thrown into a pond to drain it as fast as the water can enter, and then it can be poured out anywhere as fast as it can leave. 
While water is the most common liquid one fills a Bottomless Bottle with, any liquid can work. It can even be filled with acid and lava and the bottle itself will still be safe to touch while its contents can be used as a powerful weapon. 
Some Bottles are also infused with gems that allow them to generate a steady supply of content. 
== Variants ==
=== Bottomless Bottle of Booze ===
The Bottomless Bottle of Booze is a popular variant of the Bottomless Bottle that generates its own supply of beer. The most common variant can create three gallons a day and holds ten thousand gallons.