The Bübi Bottle may look like a normal plastic water container, but it's actually made from firm, yet supple, silicone. This means you can roll it up when you're done to save space, but we wouldn't suggest reaching for it in a bar brawl.
It's probably not going to help you win any fights, but it can certainly help you recover from one. The bottle's flexibility, combined with the insulating properties of silicone, means it can pull double duty as a hot water bottle for soothing your bruises. It's like getting two bottles for the price of one, or rather the price of two in this case seeing as it costs around £20. But since it holds its shape when unrolled, unlike those collapsing Vapur bottles which are like drinking from a plastic bag, we'd go with a Bübi any day. [Bübi Bottle via NotCot]