War for your nerves because this puzzle will challenge a lot your dexterity !!
This puzzle called BQTTLE was made by Sandor Bozoki (he also makes some impossible bottles with matches inside) and presented during last IPP in London (2014). It is composed of a metal chain, a rubber O-ring and a small glass bottle.
The good thing with this puzzle is that you cannot damage the bottle with what is inside!
The goal is to free the O-ring. It is not difficult to understand how to do that but really much more difficult to do it. Indeed, it requires a lot of dexterity to solve it, and even using dexterity, this is not an easy task...Reassembling the puzzle is more difficult than solving it. So if you have some difficulties to solve it, good luck then :-)
The puzzle comes with the solution and a tool to take the O-ring out of the bottle in case the chain is too much knoted (you can unscrew the cap of the bottle), which is a good idea.
I was wondering why putting a metal chain that may create knots, but I think it's because it's better than rope for the gravity.
To conclude: a cheap puzzle that you should buy if you like bottle puzzles, but much more important if you like dexterity puzzles! Otherwise, perhaps not the puzzle you should have...