The thing about water bottles is that they take up the same amount of room whether they are full or empty.
The Waterbelt is a two-liter water container that takes up less and less space as you use it. When it’s empty, it takes up very little space in your bike bag. And it’s not just an alternative to a water bottle. Use it as a reservoir for a shower, attach a drinking hose, or a water purification system with optional accessories.
It can be worn like a money belt around your waist or attached to the exterior of your backpack.