
Even dirty diapers are tamed by the unrelenting chill of Clean Box.
As the sweltering summer hits Japan, a lot of unpleasant things come with it, from blisteringly dangerous heat to everyone’s least favorite houseguests, cockroaches. But one other awful side-effect of summer is that garbage really starts to stink, especially in Japan were many people eat fresh fish on an almost daily basis.
Here to remedy some of these problems is Nakanishi Kinzoku Kogyo and their product the Clean Box. By blending the technology of a standard kitchen freezer with the highly sophisticated design of a rubbish bin, Clean Box can store your refuse, especially the organic stuff, at -11 degrees Celsius (12 degrees Fahrenheit) thus arresting the production of bacteria known to raise a stink.
That temperature might seem like an arbitrary homage to Spinal Tap, but surprisingly the cutoff for diapers to smell horrible is said to be -10 degrees, so lowering it by one degree provides added diaper protection while conserving power and wear on equipment.
Nakanishi Kinzoku Kogyo got the idea back in 2017 when they read people discussing putting garbage in their kitchen freezers to eliminate smells online. That lifehack never really caught on because people weren’t crazy about putting dirty diapers next to their frozen peas, so the company decided that instead of putting garbage in freezers they could put a freezer inside a waste bin. A 2016 survey found that about one in five people have tried putting garbage in the fridge or freezer, and among them only about one and five continued to do so.
Clean Box’s development wasn’t without its challenges. Accommodations for air flow, coolant, and condensation needed to be made in a very compact space. The first limited run of 100 Clean Boxes were released in 2019 and sold out almost instantly, and in April of this year a crowdfunding campaign raised over 40 million yen in pledges. They can now be increasingly seen in major appliance stores around Japan with a price tag of 48,180 yen (US$358). Each Clean Box can hold 20 liters (4 gallons) and measures 69 by 23 by 44 centimeters (27 by 9 by 17 inches). The estimated energy bill to run one is about nine yen ($0.07) a day.
▼ 20 liters equates to about 30 diapers or six “medium” garbage bags.
Online comments were cautiously optimistic. They appreciated the idea of ridding homes of those horrible smells, but also expressed concerns about energy consumption and other potential pitfalls.
“That’s a good idea.”
“Just putting it in the fridge is fine I think.”
“I normally put fruit and vegetable peels in a bag in the freezer…but I guess that wouldn’t work with diapers.”
“Maybe designing an odor-proof bag would be better so as not to use electricity?”
“I feel like YouTubers are going to do weird stuff with this thing.”
“But when you take the bag outside doesn’t the frost make it all wet? And would the bag be easier to break if frozen?”
“At that price, can’t you just buy a normal freezer and put garbage in it?”
“Why stop there? Let’s make them nuclear powered too!”
“I think 10,000 yen is probably a more reasonable price.”
Although its not without its issues, the Clean Box has clearly shown itself to be in demand so far, and Nakanishi Kinzoku is currently looking to expand sales to hotter parts of the globe like Southeast Asia. They’d probably also do well with restaurants, who tend to have a lot of organic waste and a vested interest in not smelling like a dump.
So, it is possible that Clean Boxes might become a common sight before too long, but for those looking for a more low-tech method, the Tokyo Police have a neat idea.
Source: FNN Online Prime, PR Times, My Game News Flash
Images: PR Times
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!



How to dispose of pizza boxes: Life hack from Japanese garbage man goes viral online 【Video】
Japanese company uses “crow language” to keep them away from garbage 【Video】
“Japan needs more public trash cans!” – Our Japanese reporter sympathizes, though he doesn’t agree
Ramen restaurant in top Tokyo tourist neighborhood skips price gouging, but how does it taste?
7-Eleven Japan releases a crazy new viral sandwich: Chocolate Sprinkles and Whipped Cream
Can you make butter by running with a pouch filled with cream? Let’s find out[Taste test]
Japan now has a “for foreign tourists only” Mt. Fuji sightseeing train[Video]
Studio Ghibli releases the My Neighbour Totoro tea caddy, with a magical self-closing lid
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Fake police phone scam also highlights dumb stereotype about how foreigners speak Japanese[Video]
Fish and chips shop in Japan is highly rated by foreigners, but will it impress a Japanese local?
Amazing exhibition of Japan’s legendary “cursed katana” is going on right now【Photos】
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Tokyo government organizes food truck event to clear out delinquent/homeless teen gathering area
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Nine amazing off-the-beaten-path cherry blossom spots in Japan for yaezakura and shidarezakura
Stunning central Japan wisteria festival is like a purple fantasy straight out of a Ghibli movie
Create a tiny Ghibli anime world on your bookshelf with new miniature papercraft art kits
When will the cherry blossoms reach full bloom in Japan this year?[Forecast]
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
Train station platform ramen store closes its doors on half a century of history in Tokyo
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
Virtual idol Hatsune Miku redesigned with look that adds new elements and brings back old ones
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says