Disclosure: This post contains affiliate links. If you buy through one of them, I may earn a small commission at no extra cost to you. Lineups, labels and prices change often in Japan – especially with seasonal editions.
Quick Picks
- The classic, clean benchmark: Oi Ocha (Ito En) – light, clear and lightly bitter. Also the easiest to buy outside Japan. Oi Ocha on Amazon
- Richest and most “green”: Ayataka (Coca-Cola) – blended with matcha for a fuller, slightly cloudy cup.
- Most “freshly brewed” feeling: Iyemon (Suntory) – developed with Kyoto tea merchant Fukujuen.
- Freshest, lightest: Namacha (Kirin) – partly cold-extracted for a fresh, gentle taste.
- For the evening: a bottled hojicha, or a caffeine-free barley or grain tea.
- Want to recreate it at home? A cold-brew bottle and good loose sencha make a better, cheaper “bottled tea” than anything on the shelf. Nio Teas’ sencha collection – at the time of writing, ordering through the links on this page automatically applies a 10% discount at checkout, no code needed. Offers can change, so check the final price in your cart.
Below: what each brand tastes like, how to read the labels, hot vs. cold bottles, and how to make your own bottled-style tea at home.
Walk into any Japanese convenience store and you’ll find a wall of green tea bottles – and almost all of them are unsweetened. For visitors used to sugary iced tea, it’s a revelation: real, cold, refreshing green tea for a couple of hundred yen, available on every corner and in every vending machine.
The problem is choosing. The big four – Oi Ocha, Ayataka, Iyemon and Namacha – all look similar on the shelf, and the labels are in Japanese. Here’s how they differ, so you can find your favorite on your first day.
The Problem You’re Actually Trying to Solve
You’re in Japan (or planning a trip) and want to try the famous bottled green teas. Or you’ve already tried one and want to know which others to taste, how they differ, and how to get something similar back home.
Who This Article Is NOT For
- If you need a caffeine-free option, see my guide to mugicha – Japanese roasted barley tea, which you’ll also find in every konbini.
- If you want to brew loose-leaf tea at home instead, my sencha brand comparison covers where to buy good sencha.
- If you’re looking for sweet milk tea or flavored drinks, those are on the same shelf, but this guide focuses on unsweetened green tea.
The Big Four, Compared
| Brand | Maker | Style | Taste | Best for |
|---|---|---|---|---|
| Oi Ocha | Ito En | Clear sencha | Light, clean, lightly bitter | Everyday benchmark, with food |
| Ayataka | Coca-Cola (Japan) | Matcha-blended | Fuller, rounder, slightly cloudy | People who like a rich “green” taste |
| Iyemon | Suntory | Kyoto-style green tea | Balanced, gently bitter, aromatic | A “teapot-brewed” feel |
| Namacha | Kirin | Partly cold-extracted | Fresh, light, gentle | A softer, less bitter cup |
Oi Ocha (Ito En)
Oi Ocha is the original. Ito En began selling canned green tea in 1985, renamed it Oi Ocha in 1989, and moved it into plastic bottles in 1996 – making it one of the pioneers of ready-to-drink green tea. It’s clear, light and refreshingly bitter: the taste most people picture when they think of Japanese bottled tea.
Oi Ocha is also the easiest to find outside Japan, so if you fall in love with it, you can keep drinking it at home. Ito En also sells variations, such as a stronger “koi” version with more caffeine and aroma, and premium editions in some seasons.
Ayataka (Coca-Cola)
Ayataka was launched by Coca-Cola in Japan in 2007 and has become one of the country’s top green tea brands – it reported its highest-ever sales in 2025. Its signature is matcha: the tea is blended with matcha, which gives it a slightly cloudy look and a fuller, rounder, more intensely “green” flavor than a clear sencha. Coca-Cola works with Kanbayashi Shunsho Honten, a historic Uji tea house, on Ayataka products.
If you find Oi Ocha a little thin, Ayataka is the one to try next.
Iyemon (Suntory)
Suntory launched Iyemon in 2004, in partnership with Fukujuen, a long-established Kyoto tea merchant. The brand is named after Fukujuen’s founder, and a Fukujuen tea master selects the leaves. Iyemon aims for the feeling of tea poured from a teapot: balanced, aromatic and gently bitter. Suntory adjusts the flavor over time to match changing tastes.
Namacha (Kirin)
Kirin’s Namacha uses partly cold extraction – brewing some of the tea with cold water – which gives a fresh, gentle, less bitter taste. It’s a good pick if you find other bottled teas too astringent.
Beyond the Big Four
- Bottled hojicha – roasted, toasty and lower in bitterness; a nice choice in the evening (it still contains some caffeine).
- Caffeine-free grain teas – mugicha (barley tea) and blended grain teas like Coca-Cola’s Sokenbicha are toasty, caffeine-free and perfect in summer.
- Premium editions – some brands sell pricier bottles made with gyokuro or first-harvest tea. Worth trying once.
- Seasonal and regional editions – limited flavors appear throughout the year, so the shelf is never quite the same twice.
Which Bottle for Which Moment?
| Moment | Grab | Why |
|---|---|---|
| With sushi, onigiri or a bento | Oi Ocha | Clean bitterness cuts through rice and fish |
| Mid-afternoon slump | Ayataka or a “koi” (strong) green tea | Fuller flavor and a bit more caffeine |
| A long train ride | Iyemon | Balanced and easy to sip slowly |
| A hot summer walk | Namacha or mugicha | Light and refreshing; mugicha is caffeine-free |
| After dinner | Hojicha or a grain tea | Gentle and toasty |
| A cold winter morning | Any hot bottle from the heated cabinet | Warms your hands as well as you |
How to Read the Labels
You don’t need to read Japanese – just look for a few words:
| Japanese | Meaning |
|---|---|
| 緑茶 (ryokucha) | Green tea |
| 無糖 (mutō) | Unsweetened |
| 濃い (koi) | Strong / rich |
| ほうじ茶 (hōjicha) | Roasted green tea |
| 麦茶 (mugicha) | Barley tea (caffeine-free) |
| カフェインゼロ | Caffeine-free |
| 抹茶入り (matcha iri) | Contains matcha |
Most plain green teas in Japan are unsweetened by default. Sweet drinks are usually labeled as milk tea, lattes or “tea” in Western style – check before you buy if you want zero sugar.
Hot or Cold?
In autumn and winter, Japanese convenience stores and vending machines sell hot bottled tea. In vending machines, hot drinks are usually marked with a red label (あったか〜い, “warm”), and cold drinks with blue (つめた〜い, “cold”). In convenience stores, hot bottles sit in a heated cabinet near the register. Hot bottles are usually smaller and have caps designed for heating.
A warm bottle of green tea on a cold morning is one of the small pleasures of travel in Japan.
How to Make “Bottled Tea” at Home
Bottled tea is convenient, but it’s easy to make a fresher, cheaper version yourself:
- Use a cold-brew bottle. A bottle with a built-in filter makes it effortless. Cold-brew tea bottles on Amazon
- Add good sencha. About 10g of loose sencha per liter of cold water.
- Refrigerate for 2-3 hours. Then remove the leaves or filter.
- Want an Ayataka-style cup? Whisk a little matcha (about 1g) into a small amount of water and stir it into your cold-brewed sencha.
- Drink within a day or two. Homemade tea has no preservatives.
The result is smoother and sweeter than most bottled teas, with none of the plastic waste.
A Few Things People Ask Me
Which bottled green tea is most popular in Japan? Oi Ocha, Ayataka and Iyemon are consistently among the leading brands. Each has loyal fans.
Are Japanese bottled teas sweetened? Plain green teas almost never are. Look for 無糖 (unsweetened) on the label to be sure.
Can I buy Oi Ocha outside Japan? Yes – it’s the most widely exported, found in many Asian supermarkets and online. Ayataka, Iyemon and Namacha are much harder to find abroad.
Do bottled green teas have caffeine? Yes. For zero caffeine, choose mugicha or another grain tea.
Where I Landed
Try all four on your trip – it’s one of the cheapest, most fun food experiences in Japan. Start with Oi Ocha as your benchmark, try Ayataka if you want something richer, Iyemon for a teapot-style cup, and Namacha for something lighter. When you get home and miss them, Oi Ocha is easy to find – and a cold-brew bottle with good sencha will give you something even better.