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Transform your favorite water bottle into a portable cold brew coffee maker. This universal, extendable filter fits a wide range of popular bottles, so now you can easily brew your coffee anywhere.
Transform your favorite water bottle into a portable cold brew coffee maker. This universal, extendable filter fits a wide range of popular bottles, so now you can easily brew your coffee anywhere.
614 backers pledged $24,309 to help bring this project to life.

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Rumble Go | Portable Cold Brew Coffee Maker

$24,309

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Cold brew coffee just got a lot more portable.

Rumble Go™  transforms your water bottle into a portable cold brew coffee maker. It could be the world’s simplest way to make great cold brew outside your house. 

We’ve taken our Kickstarter-created Rumble Jar filter and given it a universal, height-adjustable design that lets you transform your own water bottle into a cold brew coffee maker. Whether you own a Nalgene®, Hydro Flask®, Klean Kanteen®, or CamelBak® bottle, you'll be able to take cold brew with you on the go. And if you don’t own a compatible bottle (or just want a new one for your coffee), we’re offering a great bottle as an option too.

The Rumble Go filter fits a range of the most popular wide-mouth water bottles. Just take a look at the list of compatible 16-32oz bottles below. In case yours isn't listed, we've included the relevant dimensions so you can measure your own bottle for compatibility.  

Don't see your bottle listed? It could still be compatible, but we haven't had a chance to test it out yet. So go ahead and measure yours (and please let us know if it looks compatible!) 

Upcycle that old water bottle and turn it into a coffee maker.

If you're like us, you've got about a dozen reusable water bottles hanging around. Maybe even more than that. And they probably sit on your shelf never getting used, but you don't want to throw them away. Well, here's your chance to repurpose one of them and give it a brand-new life as a coffee maker. Our filter-only reward option is for the folks who don't want to buy yet another drinking vessel and would rather just upcycle their own.

Actual shot of my cupboard (don't judge). I spy FIVE compatible bottles that could become coffee makers!
Actual shot of my cupboard (don't judge). I spy FIVE compatible bottles that could become coffee makers!

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Why does cold brew need to be more portable? 

Cold brew is the ideal coffee format for people on the go. So much of traditional hot coffee preparation involves finding a way to heat up water. With cold brew, there's no need for heat. No stove, no kettle, no fires, no microwave, no steaming percolators, no electronic gizmos. Nothing. It’s dead simple to make: just take some coffee, add lukewarm water, let it sit, and drink it later. Pretty easy to do that anywhere.

It also stores really well (~2 weeks) and tastes great at room temperature, making it the most fuss-free coffee. That's perfect for when you’re out doing non-coffee-related things.

Why aren't portable cold brew makers widely available? Dunno...but that's why we're here!

(and for anyone totally new to cold brew coffee and curious about why it’s so popular right now, head to our project's FAQs section for a quick overview about it)

summary of last year's Rumble Jar campaign on Kickstarter
summary of last year's Rumble Jar campaign on Kickstarter

Rumble Go's got a Kickstarter bloodline.

Last year we sought to create the world’s simplest cold brew coffee maker when we debuted our Rumble Jar on Kickstarter. We started by building a totally new, sturdy and lightweight stainless steel filter that was designed by cold brew pros to make great tasting coffee. We added a shock-absorbing silicone cap to secure the filter and allow it to nest fully inside the world’s most versatile (but not very portable) drinking vessel: the Mason jar. 

Rumble Jar: the inspiration for the new Rumble Go
Rumble Jar: the inspiration for the new Rumble Go

With 1200+ backers, we were blown away by the initial reception to Rumble Jar. And we were even more blown away by the feedback from backers after they’d received and used their Rumble Jars (feel free to peruse our Comments section in all its honest glory...we're pretty proud of it!). We patted ourselves on the back for a bit, and then we went back to our backers to hear more about their experience. One thing became obvious: Mason jars are great when you're at home, but they’re not very portable. Folks wanted something they could take with them out the door. So we got started on the Rumble Go filter.

Original Rumble Jar at-home filter (left) | New Rumble Go portable filter (right)
Original Rumble Jar at-home filter (left) | New Rumble Go portable filter (right)

What’s changed? This filter GROWS (and shrinks).

One of the original Rumble Jar's best features was its concept of nesting the filter fully inside the jar, since that's the only way to maintain the integrity of the jar's seal and keep the vessel airtight and leakproof. Just like with Mason jars, these water bottles all have great seals too, so we knew to stick to the script and maintain the fully-nested design.

This issue is that all these different brands of water bottles come in unique shapes and sizes, which meant that our filter would therefore need to be adaptable. We took a look at the most popular bottles folks were carrying around with them, and then re-designed the filter so that it could fit as wide a range of them as possible. 

To make this work, we blew out the metal base of the original filter to make way for a new, height-adjustable silicone version. We built this food-grade silicone base with a unique ridged design so that it could be secured in 10 different positions, depending on the height of your water bottle. So our filter can shrink as short as 6.5” or grow as tall as 7.75”, fitting into a whole lot of popular 16-32oz wide-mouth bottles along the way.

A nice side benefit with this design: the filter grows as the bottle grows. So if you own a bigger bottle, you can fit more grounds into the filter and not sacrifice brewing strength. The filter can fit a maximum of about one cup of ground coffee.

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Some stuff hasn't changed. And that's a good thing. Let's get into that...

Still a sturdy filter designed specifically to make good cold brew.

The 18/8 stainless steel filter has 200 micron holes. It's the ideal size for making cold brew the proper way: using coarse grounds. But you can always use finer grounds too in a pinch.

Still a fully-nested design that protects the original seal.

A fully-nested filter means your bottle's seal stays intact. That keeps your bottle as leakproof and airtight as it was originally intended. Don't ever mess with seals.

Still a highly-durable, rattle-free design.

The shock absorbing silicone cap + base tightly secure the filter and protect your bottle.

Flexible silicone cap + base provide cushion between your bottle and the metal filter
Flexible silicone cap + base provide cushion between your bottle and the metal filter

Still a dead simple prep process.

Step 1: Pour coarse coffee grounds into filter. Put silicone cap on filter. Place into bottle.

Step 2: Pour water into bottle and secure the bottle's cap. Now the fun part! Give it a quick shake (more of a tip-over really) until you hear the "rumble" that activates the brew process.

Step 3: Sleep while it steeps for 8-24 hours. Then remove the filter and enjoy.

Still a dead simple cleanup process.

Detach all 3 pieces and quickly wash by hand. Filter, base and cap are dishwasher safe too.

Still looks good. Still lasts long. Still priced reasonably.

Prices for high-quality coffee gear can get ridiculous. We're happy to be the remedy.

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A bit about the rewards. And our optional bottle.

We know how much folks love their bottles. Hopefully Rumble Go will give you a reason to love yours even more. So if you've got a great bottle on-hand, all you'll need is our filter-only reward option. But if you want a new bottle for your coffee, we've added an option for you.

The folks at Fifty-Fifty know how to make great bottles, and they'll be making a whole bunch of them for us, in your choice of 2 colors (Dark Black and Brewberry Blue) featuring a fancy laser-engraving of our logo. Most of our day-to-day prototype testing was actually done using this bottle, so we know it works really well with our filter. As for deets, these bottles are 20oz wide-mouth double-walled vacuum-insulated 18/8 stainless steel bottles with a cafe flip cap to prevent splashing. That's a mouthful way of saying it's a super high-quality bottle that keeps hot coffee hot and cold coffee cold for hours. Its slimmer profile fits in a typical cupholder, bike-mounted bottle holder or backpack sleeve.

NEW! Our $20K stretch goal gave us a 3rd bottle color option: People's Purple 

As a result of hitting our $20K stretch goal, there's now a third color choice in our 20oz bottle lineup. We let backers vote on this one, and they picked People's Purple! 

Bottle color choice #3: People's Purple
Bottle color choice #3: People's Purple

Finally, you'll also get your choice of two silicone cap and base colors: Orangey-Red (shown throughout this campaign) and Dark Black. Both colors are shown below (but a warning: this is in fact a photo of the original Rumble Jar caps, not the new Rumble Go caps).

your choice of cap + base color: Orangey-Red and Dark Black
your choice of cap + base color: Orangey-Red and Dark Black

Want higher quantities of a reward tier than just a two-pack? No problem! Just reach out to us, and we'll arrange a bigger pack for you by using a custom pledge amount.

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twin brothers pretending to make coffee for a photo shoot
twin brothers pretending to make coffee for a photo shoot

About Us

We’re Hans & Karl, the same twins who brought you Rumble Jar last year. But you’re probably reading this section less for an inflated bio and more for a feel of whether we’ll deliver. We understand your skepticism. As longtime Kickstarter backers, we’ve seen folks stumble on execution (or worse). Well...we delivered our Rumble Jar rewards on-time last year, and folks were really happy with what they got. Seriously, have a read through our comments section (how many other creators would encourage that?!). Rumble Jar was actually the 6th Kickstarter campaign we’ve created together (here are the other 5). All were successfully funded, and all were delivered on-time or within a month of promised. It’s a Kickstarter track record we brag about because it means our backers are happy, and that’s the point of this whole thing.

In terms of philosophy, our products come from a shared design mindset: simpler is smarter. Us twins recently had a pow-wow to help think through the future of the Rumble product line. In the end, we boiled everything down to a simple list called "Stuff We Like". Here’s that list. Nothing groundbreaking here, but it gives you an idea of how we approach stuff.

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Timeline & Production Plan

We’ve got a big headstart this time around, since much of the filter design and know-how have been carried over from our earlier Rumble Jar campaign. Production partners have proven themselves, molds have been built, a few pre-production prototype rounds have been tested, and our filter manufacturing game is a tad more honed. That being the case, we better be able to match our Rumble Jar’s on-time delivery or else shame-shame on us!

  •  October: Kickstarter campaign ends
  •  November: collect backer info; place POs with manufacturer to begin filter production
  •  December: design and order packaging; place custom bottle order
  •  January: delivery of all parts, followed by assembly
  •  February: buffer for unforeseen delays

Shoutouts 

  • Our original Rumble Jar backers for telling us what they wanted!
  •  Damon and Bowdy for your excellent video work and golden voice, respectively
  •  Chris for kicking out last-minute motion graphics super fast as usual (creators, call him!)
  •  Hubbard M. Jones for a quick turnaroud on great photos (obvious which ones are yours)
  • Fellow Kickstarter creators and the fine folks at Kickstarter HQ for all the inspiration 

Just to be clear: Nalgene®, Hydro Flask®, Klean Kanteen®, CamelBak® are trademarks of their respective owners, and we are not endorsed by, affiliated with or associated with any of them. We just want you to enjoy their products even more.

Rumble Go, Rumble Jar and our patent-pending filters are courtesy of Buffoonery Factory LLC and offered, designed and built with lots of love.

Risks and challenges

As we mentioned, this is our 7th Kickstarter campaign together. And when it comes to delivering, our track record is dang good, if we do say so ourselves: we've fulfilled every reward tier within one month of its estimated date. And while we're way better than we were a year ago at manufacturing cold brew filters, this is still a totally new product that's facing all the same potential pitfalls related to production delays and issues. We like to think we've accounted for all of the problems, but anyone who tells you that is lying, so we won't go there. However, we try to do a few things ahead of our launches that help keep us on track, such as 1) making sure a customer would be happy if we shipped them one of the pre-production samples shown in the campaign photos and video, and 2) adding one extra month to our "most-conservative" timeline (other creators should feel free to borrow that method...it works!).

Anyway, we'll always be honest with you about where we are and keep you updated if anything goes wrong. We've seen a lot already and we think we've gotten pretty good at dealing with production and delivery mishaps, but a brand-new issue comes up every time we do this thing. Whatever it is this time...we'll figure out a way to conquer it. Thanks to you all for being part of our journey, and hopefully Rumble Go will be a part of your own journey! <3

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Support

  1. Select this reward

    Pledge US$ 5 or more About US$ 5

    Just here to help!

    Thanks for keeping the world awash in delicious and affordable cold brew!

    Includes:
    • a more caffeinated (i.e. better) world
    • our progress reports (optional)
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  2. Select this reward

    Pledge US$ 19 or more About US$ 19

    Rumble Go - Filter Only

    The universal Rumble Go filter without the bottle. This is for the folks who already own a great wide-mouth bottle to use with it.

    Includes:
    • Stainless steel filter
    • Silicone base + cap (color choice)
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    Ships to Only certain countries
    226 backers
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  3. Reward no longer available

    Pledge US$ 34 or more About US$ 34

    Rumble Go Filter + 20oz Bottle EARLY

    Our complete portable cold brew kit at a serious discount for our earliest fans and risk-takingest backers.

    Includes:
    • Stainless steel filter
    • Silicone base + cap (color choice)
    • 20oz insulated bottle (color choice)
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    Reward no longer available 100 backers
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  4. Select this reward

    Pledge US$ 36 or more About US$ 36

    Rumble Go Filter Only - DOUBLE

    2 Rumble Go filters, without the bottles. Generous folks can gift one to their significant other. True coffee fiends can double-fist. Everyone wins.

    Includes:
    • 2x Stainless steel filters
    • 2x Silicone base + cap (color choice)
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    123 backers
    $
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  5. Select this reward

    Pledge US$ 39 or more About US$ 39

    Rumble Go Filter + 20oz Bottle

    With our 20oz bottle and a Rumble Go filter, this is all the gear you need to make cold brew. Just add coffee, water and a rumble.

    Includes:
    • Stainless steel filter
    • Silicone base + cap (color choice)
    • 20oz insulated bottle (color choice)
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    103 backers
    $
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  6. Select this reward

    Pledge US$ 73 or more About US$ 73

    Rumble Go Filter + 20oz Bottle DOUBLE

    Two Rumble Go Filters, two 20oz bottles and two lives about to get a whole lot better thanks to cold brew.

    Includes:
    • 2x Stainless steel filters
    • 2x Silicone base + cap (color choice)
    • 2x insulated bottles (color choice)
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    48 backers
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Funding period

- (30 days)