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BOSS

BOSS Coffee by Suntory – Rainbow Mountain Blend Japanese Flash Brew Coffee, 6oz 12 Pack, Imported from Japan, Espresso Doubleshot, Ready to Drink, Contains Milk, No Gluten

  • Based on 1,125 reviews
Condition: One-time purchase
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Availability: In Stock.
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Arrives Oct 31 – Nov 16
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Features

  • NO.1 CANNED COFFEE BRAND IN JAPAN - Conveniently found in vending machines and convenience stores across the country, Suntory has innovated BOSS Coffee for over 30 years to become the no.1 canned coffee brand in Japan (2021, Intage).
  • RAINBOW MOUNTAIN BLEND - Using beans sourced from seven grow regions managed by Guatemalan Coffee Association farmers, Suntorys expert brewers blend the unique flavors produced in diverse climates to create our signature Rainbow Mountain Blend.
  • STRAIGHT FROM JAPAN - Due to popular demand from BOSS fans, we are delighted to bring Rainbow Mountain Blend, with the same great packaging and flavor as in Japan, to the US market. Enjoy an authentic taste of Japanese coffee culture.
  • READY TO DRINK COFFEE - Rainbow Mountain's 6 fl.oz can is perfect to slip into a pocket or bag and take on-the-go for a high quality coffee pick-me-up anytime, anywhere.
  • NATURALLY BREWED CAFFEINE - With only 70 calories and 110mg of naturally brewed caffeine, don't underestimate this handy can size. Rainbow Mountain Blend packs the equivalent of a doubleshot of espresso in every can, more than enough to get you going.

Description

BOSS RAINBOW MOUNTAIN BLEND is created using premium beans selected from 7 growing regions managed by members of the Guatemalan National Coffee Association, Anacafé. Each region has a different climate producing beans with unique characteristics. Selected Growing Regions: Answering to the requests for RAINBOW MOUNTAIN BLEND from BOSS US fans, Suntory brings you the same great flavor and packaging as in Japan. This flagship coffee blend is made by expertly combining beans from 7 selected Guatemalan growing regions, with each bean bringing a unique addition to this perfectly balanced coffee. BOSS Coffee started its history in 1992 in Japan. At Suntory, we have been developing Ready-To-Drink (RTD) coffee for over 30 years, now it’s time for you to enjoy it. The flash brew difference in one word: Flavor. Coffee beans are finely ground and brewed hot. Flavor is released, then trapped in a flash of ice. All to deliver one perfect can of BOSS Coffee.

Product Dimensions ‏ : ‎ 2.08 x 2.08 x 4.13 inches; 6 ounces


UPC ‏ : ‎


Manufacturer ‏ : ‎ Suntory B&F N.A.


Units ‏ : ‎ 72 Fluid Ounces


Best Sellers Rank: #43,884 in Grocery & Gourmet Food (See Top 100 in Grocery & Gourmet Food) #43 in Ready to Drink Liquid Coffee


#43 in Ready to Drink Liquid Coffee:


Customer Reviews: 4.6 4.6 out of 5 stars (1,125)


Brand Name: BOSS


Item Form: Liquid


Flavor: Coffee with milk and sugar


Caffeine Content Description: Caffeinated


Coffee Roast Level: Light Roast


Container Type: Can


Diet Type: Gluten Free


Unit Count: 72 Fluid Ounces


Number of Items: 12


Special Ingredients: Milk, Sugar


Region of Origin: Japan


Specialty: Flash Brew


Certificate Type: JPPS


Allergen Information: Milk


Coffee Type: Prepared Coffee Drink


Variety: Rainbow Mountain Blend


Caffeine Content Per Serving: 110 milligrams


Country as Labeled: Japan


Manufacturer: Suntory B&F N.A.


UPC: 088857019949


Coffee Blend Name: Rainbow Mountain Blend


Age Range Description: 18+


Item Type Name: Canned Coffee


Liquid Contents Description: Coffee


Sweetness Description: sweet


Item Weight: 6.08 ounces


Item Dimensions: 2.08 x 2.08 x 4.13 inches


Item Package Weight: 2.77 kg


Size: 6 Fl Oz (Pack of 12)


Item Volume: 2128.8 ml


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 31 – Nov 16

This item is non-returnable:

Non-returnable due to Food safety reasons

View our full returns policy here.

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Top Amazon Reviews

    • Wow. Where do I even begin?
Let me take you back to October of 2017. I had made my first trip to the wonderful land of Japan and nestled in among the good people who live there. During my stop in Kyushu, I ran across this BOSS Rainbow Mountain Blend coffee at an AEON Mall. At the behest of my friend who I was staying with at the time, I bought some to consume on the spot. It was already chilled, and as soon as the coffee hit my taste buds, I was in for a real treat. I was sure to buy up some more to take home with me on the flight back to America. Don't let the 6 oz size fool you. These little coffees pack a wallop and the taste is phenomenal. Even though I'm not one to get cream or sugar in my coffee (as Brian Griffin says, I like mine black as sin), the combo of everything feels just right. The quality of the roast is quite solid. Consisting of slightly woody notes, with not a sign of burnt flavor, this should appease any coffee snob anywhere. I'm so glad Suntory finally came to their senses and started properly importing this stateside for our enjoyment. The price is certainly higher than your typical Starbucks brew, but this really is a unique experience, almost a rite of passage that everyone should go through, and a good taste of what the Japanese like to call quality coffee. This beverage gets my seal of approval. Even if you find the price a bit too high, I'd still consider getting one case for the novelty factor and, who knows, maybe you'll get hooked? :) ... show more
Reviewed in the United States on December 30, 2020 by Mark Twain
    • Delish! Worth Every Penny, No Doubt!
Not quite as pristine as the black but still so yummy. They call it BOSS for good reason… it leads head and shoulders above the rest! Slightly smokey, clean and smooth. Perfect pick me up treat in the afternoon. I regret nothing!
Reviewed in the United States on June 15, 2026 by Pru
    • Refilled my HEAT gauge.
Bought this as a fan of Yakuza, got made a fan of BOSS coffee. Genuinely, insanely good coffee that beats the hell out of Starbucks RTD's which by my estimation, are far more concerned with sugar than coffee. 110mg of caffeine per can means you're getting a kick without blowing your heart valves and the modest size means you can easily put down a can in its entirety in a sitting, as well as it being convenient for travel. I wish this was cheaper or more readily available, I would drink this regularly if I could. ... show more
Reviewed in the United States on May 12, 2026 by David
    • Great product but the price hurts the wallet
I love these coffees a lot. I like to buy a case to keep on hand for the days that I'm feeling sluggish or having a hard time rolling out of bed since they give more caffeine than a 20oz soda at a literal fraction of the calories. I'd make them a part of my daily routine if not for the fact they run so expensive. At $45 for a case of 12 it's just not viable for every day drinking. ... show more
Reviewed in the United States on January 11, 2025 by Boccs
    • Road trip fuel
Great for road trips
Reviewed in the United States on September 20, 2026 by Music Lover
    • Intensity and flavor
As my title states, this coffee has an intense yet balanced flavor. I enjoy the caffeine strength
Reviewed in the United States on June 28, 2026 by Bob Toddler
    • Make sure you drink it cold
Absolutely freaking DELICIOSO coffee!!! MAKE SURE YOU DRINK IT COLD!!! Totally different taste cold than room temp
Reviewed in the United States on June 7, 2026 by Danny G
    • Rainbow Mountain Blend, the apex of Japanese canned coffee culture.
Review Image by Boss Coffee Aficionado
In Japan, people are always on the go; which is why Japan is a country that heavily strives for convenience. Canned Coffee was invented in the 1950’s for exactly that purpose. A quick pick me up, in a can, on the go. Originally conceived by UCC, Suntory absolutely perfected RTD (Ready-To-Drink) canned Coffee in the 90’s with their BOSS brand, and with it, the signature ‘Rainbow Mountain Blend’. What separates Rainbow Mountain from the rest, is its undeniable balance, and uncompromising depth of flavor. Not too sweet, not too bitter, small can, but a sizable caffeine dose. Rainbow Mountain has been notorious coveted by aficionado’s here in the States for several reasons. For one thing, prominence of Japanese culture has been on the rise for more than a decade, which means some curiosity likely stemmed from the fantastically entertaining ‘Alien Jones’ Japanese TV spots featuring the product in Japan (which I highly recommend as a quick but satisfying internet search). Secondly, the product was incredibly difficult to get ahold of before Suntory decided to bring it over. I for one am truly delighted that Suntory graced us with this absolute gem of a product. The BOSS brand has an indelible mantra surrounding it, that embodies the work life culture in Japan. People work hard to be their absolute best, and coffee is a staple that helps empower them. Suntory has applied that ideology into making a superior coffee product that leaves the consumer feeling as though they’re ‘The Boss’. That’s why BOSS Coffee will always be my #1. ... show more
Reviewed in the United States on February 3, 2021 by Boss Coffee Aficionado

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