Photo by Beth Macdonald on Unsplash
Japanese supermarkets and convenience stores have quietly shifted most of their checkout lanes to self-service over the past few years, and almost nobody explains the system to tourists. The machines are efficient once you know the sequence, but the unwritten rules — where to bag, which basket goes where, whether to tap or insert your card — trip up first-timers constantly. Here’s what actually happens at the register, and the mistakes to avoid.
The Two-Step System: Pay First, Then Bag
Almost every Japanese supermarket (Life, Seijo Ishii, Maruetsu, Ito-Yokado) and convenience store (7-Eleven, Lawson, FamilyMart) splits checkout into two physically separate stations. Station one is the register, where you scan and pay. Station two is a long counter nearby, usually against a wall or window, with empty baskets stacked underneath and a roll of plastic bags or a box of paper ones.
The mistake visitors make: standing at the register trying to bag their items while the next customer waits behind them. This blocks the line and is the single biggest self-checkout faux pas in Japan. The correct move is to transfer your scanned items from the checkout basket into a fresh basket (or carry them in the original one), walk to the bagging counter, and pack there at your own pace. Nobody will rush you at the bagging counter — that’s its entire purpose.
How the Scan-and-Pay Machines Actually Work
Most self-checkout machines fall into one of two types:
- Full self-scan: You scan every barcode yourself, then pay at the same machine. Common at Life, Daiei, and most convenience stores. Look for a green “開始” (start) or “はじめる” button on the touchscreen to begin.
- Semi-self-checkout: A staff member scans your items for you at a regular-looking counter, then slides the basket over and you move to a separate payment kiosk to tap your card or insert cash. This is extremely common at supermarkets like Seijo Ishii and Peacock. Watch for the staff member gesturing toward the kiosk — that’s your cue to walk over, not keep standing at their counter.
Payment kiosks almost always accept IC transit cards (Suica, PASMO, ICOCA), major credit cards via tap, and cash. Cash machines in Japan are nearly always bill-and-coin trays rather than slots — you pour coins into a tray and feed bills individually into a slot above it; the machine counts and dispenses change automatically. Don’t hand cash to a machine the way you’d hand it to a cashier — there’s no human on the other side to catch an underpayment, so take a second to confirm the total on screen before inserting money.
Bring Your Own Bag, or Pay for One
Since a nationwide plastic bag law took effect in July 2020, retailers must charge for plastic bags — typically ¥3 to ¥10 depending on size and store. Convenience stores will ask “レジ袋はご利用ですか?” (would you like a shopping bag?) at the register; a simple “daijoubu desu” (no, I’m fine) or a hand-wave declines it. Supermarkets assume you’re bagging yourself and won’t ask at all — you either bring your own reusable bag (eco-bag, or “マイバッグ”) or buy one at the bagging counter.
Budget travelers: a ¥100 foldable eco-bag from Daiso or a convenience store pays for itself after two or three grocery runs. If you’re staying in an Airbnb or hotel room with a kitchenette and plan to cook even a little, it’s worth buying one on day one rather than accumulating a pile of paid plastic bags. Mid-range option: most supermarkets sell sturdier insulated bags (¥300–¥800) with a cold-pack lining, genuinely useful in Japan’s humid summers if you’re carrying ice cream or raw fish back to a hotel.
Tape, Not Tying: How Bagging Actually Works
At the bagging counter you’ll usually find small rolls of clear tape mounted on the wall or counter edge. These are for sealing your own bag shut — pull off a strip, press it over the top where the handles meet, and it keeps the bag closed without a knot. There’s no need to ask permission to use it; it’s there for exactly this. You’ll also typically find a small trash bin for discarding the plastic sleeves that wrapped your basket-scanned items, and sometimes a wet cloth for wiping up spills from leaking packages — use it if something leaks, since the next customer needs a clean counter too.
A second common mistake: trying to bag fragile items (eggs, tofu, bottled drinks) together with heavy items like rice or detergent. Most bagging counters have small plastic trays specifically for eggs and tofu — look for a short stack of rectangular trays near the tape. Japanese shoppers habitually bag cold items together, separate raw meat/fish into the thin plastic sleeves provided near the meat section, and put heavy items at the bottom. Staff won’t correct you if you skip this, but your groceries will survive the walk home better if you follow it.
Convenience Store Self-Checkout Is a Different Animal
7-Eleven, Lawson, and FamilyMart have rolled out self-checkout widely in Tokyo, Osaka, and other major cities, though plenty of smaller or rural branches still staff every register by hand. At these machines, hot food (oden, fried items from the hot case) and tobacco/alcohol still usually require a staff tap to confirm age or handling, so don’t be surprised if a clerk steps in mid-transaction — this is normal, not an error. For anyone restocking a hotel room fridge or grabbing snacks before a long train ride, this is worth knowing before you’re standing there wondering why the machine froze on a can of beer.
If you’re traveling with a baby and stocking up on formula, diapers, or bottled water in bulk, note that most convenience stores sell these in small sizes only — supermarkets and drugstores (Matsumoto Kiyoshi, Sundrug) are far better value for baby supplies. If you haven’t sorted out a stroller or car seat yet, see our guide on renting baby gear in Japan before you’re juggling grocery bags and a car seat at once.
Timing and Where This Matters Most
Self-checkout lines move fast outside peak hours but back up badly between 6 PM and 8 PM on weekdays, when commuters stop in on their way home — if you’re near a station on the Yamanote Line or any major commuter route, expect a wait at that hour regardless of which lane you pick. Early morning (store opening, usually 8–10 AM) and mid-afternoon are the quietest windows if you want to take your time figuring out a machine you haven’t used before.
Before you fly, it’s worth registering your customs and tax-free shopping details through Visit Japan Web — it won’t speed up a supermarket checkout, but it saves real time at the actual airport, which is the checkout line that matters most on your way home.
One Splurge Worth Knowing About
If you want a souvenir-grade grocery experience rather than a purely functional one, department store basement food halls (depachika) — like those under Isetan Shinjuku or Daimaru Tokyo — use fully staffed checkout with elaborate gift-wrapping, no self-service involved, and it’s a genuinely different, more leisurely way to shop for high-end items like a fresh-fried korokke or boxed sweets to take home. It costs more than a supermarket run but it’s worth doing once for the experience, not just the food.