







☕ Elevate your coffee game with Japan’s iconic flash brew!
Suntory’s Rainbow Mountain Blend is Japan’s top canned coffee, delivering a smooth, light roast espresso doubleshot in a convenient 6oz can. Sourced from seven Guatemalan regions and flash brewed for freshness, it offers 110mg of natural caffeine and a creamy, gluten-free formula—ready to energize your busy lifestyle with authentic Japanese coffee culture.









| ASIN | B08L4KNBV6 |
| Age Range Description | 18+ |
| Allergen Information | Milk |
| Best Sellers Rank | #35,328 in Grocery & Gourmet Food ( See Top 100 in Grocery & Gourmet Food ) #37 in Ready to Drink Liquid Coffee |
| Brand | BOSS |
| Brand Name | BOSS |
| Caffeine Content Description | Caffeinated |
| Caffeine Content Per Serving | 110 milligrams |
| Certificate Type | JPPS |
| Coffee Blend Name | Rainbow Mountain Blend |
| Coffee Roast Level | Light Roast |
| Coffee Type | Prepared Coffee Drink |
| Container Type | Can |
| Country as Labeled | Japan |
| Customer Reviews | 4.6 out of 5 stars 1,127 Reviews |
| Diet Type | Gluten Free |
| Flavor | Coffee with milk and sugar |
| Item Dimensions | 2.08 x 2.08 x 4.13 inches |
| Item Form | Liquid |
| Item Package Weight | 2.77 kg |
| Item Type Name | Canned Coffee |
| Item Volume | 2128.8 ml |
| Item Weight | 6.08 ounces |
| Liquid Contents Description | Coffee |
| Manufacturer | Suntory B&F N.A. |
| Number of Items | 12 |
| Package Information | Can |
| Region of Origin | Japan |
| Roast Level | Light Roast |
| Size | 6 Fl Oz (Pack of 12) |
| Special Ingredients | Milk, Sugar |
| Specialty | Flash Brew |
| Sweetness Description | sweet |
| UPC | 088857019949 |
| Unit Count | 72 Fluid Ounces |
| Variety | Rainbow Mountain Blend |
D**D
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.
M**N
My favorite beverage on the face of the earth
Was never a coffee person until I went to Japan. I’ve tried Starbucks, Dunkin, local coffee houses near me, and sure I like a hot chocolate every now and then, but never could I get into coffee. The bitterness was always too much. But then I went to Japan, and tried this canned coffee at the recommendation of a friend who bought it at FamilyMart on a whim. Immediately, my life transformed before my very eyes. I became buff. Women threw themselves at me. All of my problems solved themselves. I got my dream job. I became rich. I was no longer mentally ill. And most importantly of all, I found a coffee I actually liked. It’s got just the right blend of sweet and bitter that doesn’t make me want to spit it out immediately. I love this coffee so much I make a 6oz can last 2-3 hours. Any quicker would be sacrilege. It’s a shame it costs so much money but the financial burden is worth it to me, because it’s a nice little treat in the morning which also helps curb my body’s apparent constant need for sugar (only 20% DV? Crazy!!). Don’t go for that crappy canned Starbucks you see at convenience stores, go the extra mile and get BOSS coffee, because it will change your life like it did mine.
M**N
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? :)
T**R
Taste The Rainbow
BOSS Rainbow Blend has landed in the states… officially! The company who makes this (Suntory) is also a bottler for Pepsi products in the southeast U.S. and, I think, use their warehouse as a distribution center for wholesaling. How that relates to the review is that this product will hopefully become more easily found in grocery stores than it has before. Other BOSS products seems to be heading in that direction as well. The product is indeed made and bottled in Japan, but the label is completely in English, with the US nutrition label on the label. Far from bitter, the high caffeine content gives it that “rainbow”, majestic vibe, as you gradually come to life with each sip of this Guatemalan origin coffee. So incredibly delicious that you come to appreciate the compact size for the punch it packs. The “dented cans” appear to be a real issue, I had at least one slightly dented can along the middle of the can’s body. However, there were no leaks and the taste of the coffee wasn’t affected. At over $2 a can though, you shouldn’t ask any less than perfection. I bought these cans at around $25 for 12 and thought that were high already, but it looks like that was a sale price since it went up again. Overall? Good but expensive. I think back to those Illy Caffe 6.8oz shots. You pay a premium for premium taste, and it is helpful to keep in mind that unlike the Illy cans, the Rainbow Blend travels an ocean to get to us. Not bad, Suntory.
B**R
Intensity and flavor
As my title states, this coffee has an intense yet balanced flavor. I enjoy the caffeine strength
P**U
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!
B**O
Rainbow Mountain Blend, the apex of Japanese canned coffee culture.
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.
D**G
Make sure you drink it cold
Absolutely freaking DELICIOSO coffee!!! MAKE SURE YOU DRINK IT COLD!!! Totally different taste cold than room temp
Trustpilot
2 weeks ago
2 months ago