file this under things you don’t need because it’s way too expensive ($325) to treat yo self, but if someone gave it to you as a gift, you would be really excited to receive it because it’s awesome.  you are looking at a filson flask, but it’s not just any flask.  it’s made out of copper and according to filson it’s leakproof.  it’s also wrapped in tin cloth and bridle leather for “durability and added grip” – which you will probably need after consuming 3/4 of its contents.