Rumble Go is here.
We've taken that great Rumble Jar filter, and adapted it to fit a range of portable water bottles. The Mason jar is great for your home, but this could be the world’s simplest way to make great cold brew outside your house. Rumble Go on Kickstarter
The universal, height-adjustable design fits a wide range of popular wide-mouth bottles. And if you don't have one on-hand, we're offering a great one as an option too.
Lots more details on our campaign page: Rumble Go on Kickstarter