Rumble Jar Cold Brew Kit

by Rumble Jar

4 reviews
$28.99

Packaging:

this product scores 3

Materials:

this product scores 3

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rumble jar cold brew kit
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Rumble Jar Cold Brew Kit

by Rumble Jar

4 reviews
$28.99

Packaging:

this product scores 3

Materials:

this product scores 3

› Expert Ratings Detail

Members save 10%
Members Log-in for FREE Shipping & Member Prices
Not a member? Learn more
Out of stock
Rumble Jar Cold Brew Kit
Red
$28.99
Variant selected
Out of stock
Rumble Jar Cold Brew Kit
Black
$28.99
Variant selected

What Makes It Mighty?

  • converts traditional mason jar into a simple cold brew coffee system
  • reusable secondary cotton filter is machine washable
  • lid and filter made from food grade silicone and 304 stainless steel
Description

Rumble Jar is a next-generation cold brew coffee maker, designed to work in tandem with the classic Mason jar. This 4-piece brew kit is all the equipment you need to make professional-quality cold brew coffee right at home. Just add coffee and water and give it a rumble. Prep time takes less than one minute, and by the morning you'll have delicious cold brew coffee ready to drink.

Each kit includes: 

  • 32oz Wide-Mouth Mason Jar (traditional)
  • Stainless Steel Cold Brew Filter 
  • Food-Grade Silicone Cap
  • Cotton Sock (optional 2nd stage filter)

The Filter—Specifically engineered for cold brew coffee, this is not your run-of-the-mill mesh filter. We built our filter from the ground-up using etched stainless steel construction that's lightweight but shockingly sturdy. The 200 micron holes allow water to circulate at a rate that's ideal for making barista-quality cold brew.
The Cap—Rumble Jar's secret sauce. Our patent-pending cap design allows the filter to be fully-nested inside the Mason jar, without interfering with the Mason jar's natural seal. As a result, your coffee stays both leakproof and airtight. 
The Mason Jar—An ideal brewing + drinking + storage vessel with a legendary seal. Our patent-pending design keeps the seal intact, allowing your coffee to stay fresher since the jar remains airtight and more resistant to oxidation (aka the "coffee killer"). A good seal also keeps it from leaking all over your hands and kitchen.


Use and care:

Step 1: Load & Lock the filter

Pour coffee grounds into the stainless steel filter and secure the silicone cap. Use the notches between 1/3 and 1/2 way up the jar as fill lines. Grounds expand so don't overfill the filter. And remember: the experts agree cold brew tastes best when brewed with coarse grounds!

Step 2: Get Your Rumble On

Place filter with grounds and secured cap in the empty Mason jar and fill jar to the very top with cold or lukewarm water. Coffee grounds like to float, so this helps ensure they remain underwater during the steeping process. 

Screw on the lid to the Mason jar and give it a rumble by rolling the jar horizontally 2-4 times. You'll hear the water "whoosh" through the filter and grounds. Do not shake vigorously.

Step 3: Steep & Sleep

Go get some shut eye and you're cold brew will be ready for you when you wake up!

Steeping time in a refrigerator: 16-24 hours. 
Steeping time at room temperature: 8-12 hours.

Step 4: Easy Cleaning

Pull the filter out, dump the grounds, give the filter and cap a quick rinse or wash them with soap. All parts (minus cotton filter bag) of Rumble Jars are dishwasher safe!

Click here for video

Where is it made?
Designed and assembled in USA. Mason Jar, packaging and tags made in USA. Filter and cap made in Taiwan. Cotton secondary filter-bag made in China.
Packaging
this product scores 3

Mighty Rating:

this product scores 3

Package free; primarily compostable except very minor components (e.g. plastic toggles or small stickers)


How is it packaged?
Cardboard box
End of use:
Recycle or compost
Materials
this product scores 3
Rumble Jar Cold Brew Kit
Rumble Jar Cold Brew Kit
Color: Red

Mighty Rating:

this product scores 3
Reusable and all natural materials, may have very minor synthetic components for functionality (e.g. gaskets)

Materials Details

Mason Jar: glass

Cap: food grade silicone

Filter: stainless steel mesh

2nd Filter: cotton

Rumble Jar Cold Brew Kit
Rumble Jar Cold Brew Kit
Color: Black

Mighty Rating:

this product scores 3
Reusable and all natural materials, may have very minor synthetic components for functionality (e.g. gaskets)

Materials Details

Mason Jar: glass

Cap: food grade silicone

Filter: stainless steel mesh

2nd Filter: cotton

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What others are saying

Overall Score

|
4 reviews
Review by Ronda Price on 5/1

I recently discovered a fondness for cold brew coffee. Coffee shops can be pricey and store bought vary in quality. Now I use coffee that I like and save money. It’s simple to use and I feel like I’m treating myself.

Review by Sarah on 11/3

My rumble jar has saved me so much money and time as the cold brew i make is just as good as Starbucks as long as you use fresh beans. I just started making a concentrate for espresso martinis too. 🙂

Review by Cynthia on 9/3
Cold Coffee Love

This Rumble Jar is GREAT for cold brew coffee! "Easy to use" is the best description for this product! I made some Michigan Cherry cold brew, and it was delicious with vanilla oat cream. Endless possibilities to enjoy!

Review by Kim B on 5/26
Great coffee

This is my new best friend. So easy to prep the night before and have awesome coffee in the morning. Only downside, which one of us gets to use it? Solution? Buy two 😊

About Rumble Jar

Coffee...we drink a lot of it. That was our "coffee expertise", at least until early 2017 when Karl got fed up with all of the existing cold brew coffee filters out there and started hacking away on some new ideas he came up with to make a better one. Hans remained skeptical. But Karl converted Hans to cold brew through a combination of sorcery and brainwashing (i.e. having him taste it) until Hans capitulated and saw the light...cold brew was better! Both of us are product designers and creators, and while we're pretty good at developing concepts, we're even better at finding folks who have real expertise to make our ideas come to life. We hunted around and linked up with the perfect manufacturing shop that strictly works on coffee devices, and off we went to designing, prototyping and playing with our different ideas. And talking to the cold brew experts...folks that didn't just learn about it yesterday, but have been seriously playing with cold brew for 10+ years, before anyone was really selling it. This group of folks had seen and made it all, so when they said, "Wow this is a really good idea," we knew we were onto something! So in late 2017, we brought Rumble Jar to life on Kickstarter. Rumble Jar's reception was pretty mind-blowing (over $50K raised in 3 weeks)! People were actually getting excited about a fairly simple cold brew coffee filter that didn't even have a single moving part. So if Rumble Jar can make it on Kickstarter, it can make it anywhere! -Hans & Karl

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