A Japanese onsen runs on a different set of rules than the pools, spas, or hot tubs most first-time visitors know, and getting them wrong is the biggest source of onsen anxiety for foreign travelers. You bathe nude — no swimwear, at nearly every traditional facility — in water shared with strangers, in a room split by gender. That surprises people expecting a resort spa robe and a private stall, and it's why so many visitors search for the etiquette before they search for the packing list. This checklist covers both: the handful of rules that actually matter, and the short list of things worth bringing once you know them.
The etiquette itself is shorter than it sounds. Wash and rinse completely at the washing stations before you ever step into the shared bathing water — most stations have a low stool, a handheld shower, and shampoo and soap, and a quick rinse isn't enough. The small towel you carry in is for modesty on the way over and for drying off after, not for the bath itself: it never touches the water, and most people fold it and set it on their head or on the edge of the tub while they soak. Tie up long hair so it can't fall in. Phones and cameras don't come into the bathing area at all, not even for a quick photo — leave them locked in your locker or robe pocket.
How much you need to pack depends on where you're bathing. A ryokan or onsen hotel almost always stocks the washing stations with shampoo, conditioner, and soap, and supplies a full towel set, so you can travel light. A day-use onsen or a neighborhood sento is more of a mixed bag — some provide the same amenities, others charge a rental fee for a towel or soap, and a few expect you to bring your own. Set the mode toggle below to match your plans and the list adjusts. Either way, keep some cash and small coins on hand: entrance fees, locker deposits, and rental fees are still cash-only at plenty of onsens, especially smaller and rural ones.
Two things are worth getting right beforehand. Tattoo policy is not one rule — it varies enormously by facility. Some traditional onsens still refuse entry to anyone with visible tattoos, plenty now allow a cover sticker, and some don't mind at all; check the specific facility's policy in advance rather than assuming, and a reserved private or family bath (kashikiri-buro) sidesteps the question entirely. On the health side, soaking in genuinely hot water for fifteen or twenty minutes raises your heart rate and pulls more fluid from your body than a regular bath — dizziness is common enough that changing rooms often post a warning, and both alcohol and an empty stomach make it worse. Drink water before and after, and keep soaks shorter than you think you need.
None of this takes long to prepare for once it's written down. Toggle ryokan or day-trip mode, set your group size, and this list settles the two questions that actually cause first-timers to hesitate at the door — what the rules are, and what to carry in with you.
Adults
Children
Set ryokan or day-trip mode to start
Entrance fees, locker deposits, and rental fees are still cash-only at plenty of onsens, especially smaller and rural facilities — carry more cash than you'd expect to need.
Cash and coins
1
Entrance fees, locker deposits, and towel or soap rental are still cash-only at plenty of onsens, especially smaller and rural facilities. Small coins matter too — some lockers take a 100-yen coin as a deposit that's returned when you're done.
These are the items etiquette actually requires — a small towel that never touches the water, something to tie up long hair, and a sealed pouch for anything that can't get wet.
Small towel
2
This is the towel you carry to and from the bath and use for modesty on the way over — it never goes into the water. Most bathers fold it and rest it on their head or set it on the tub's edge while soaking.
Hair tie or clip
2
Long hair has to be tied up before you get in — loose hair touching the shared water is one of the etiquette rules posted at nearly every facility.
Waterproof pouch or zip-top bag
2
Phones and cameras don't come into the bathing area, not even for a quick photo. Seal yours in a pouch and leave it in your locker or robe pocket instead of carrying it in your hand.
Resealable bag for wet items
1
Your small towel comes out damp, and so might a swimsuit if the facility has a mixed-bathing pool area outside the traditional baths. A sealed bag keeps the rest of your things dry on the way home.
Tattoo cover sticker
2
Tattoo policy varies a lot by facility — some still refuse entry, many now accept a cover sticker or patch, and some don't mind at all. If you have visible tattoos, pack one as a backup and check the specific facility's policy before you go.
Private bath reservation confirmation
1
Many ryokan offer a time-slot reservation for a private or family bath (kashikiri-buro), worth booking if you'd rather bathe without other guests or want to sidestep the tattoo question entirely. Keep your confirmation on hand at check-in.
How much to bring depends on where you're bathing — see the mode toggle above. Ryokans stock the washing stations; public bathhouses and day-use facilities sometimes don't.
Face wash or makeup remover
1
Everyone washes before getting in, face included. If you're wearing makeup, plan to remove it properly first rather than rinsing it off quickly at the washing station.
Razor
1
Ryokans sometimes leave a disposable razor in the amenity kit, but day-use facilities and sento usually don't. Worth packing if you plan to shave before or after your soak.
Moisturizer or body lotion
1
Onsen minerals — sulfur springs especially — can leave skin feeling drier than a regular bath does. Apply moisturizer soon after you towel off, while your skin is still slightly damp.
None of these are required by etiquette, but a hot soak dehydrates faster than you'd expect, and a spare outfit covers more than one bath in a day.
Change of clothes
2 sets
A ryokan stay often means bathing more than once — before dinner and again in the morning — and a day-trip can turn into a second soak if you're enjoying it. Pack one more set than you'd bring for a normal day out.
Reusable water bottle
2
A fifteen-to-twenty-minute soak in genuinely hot water pulls more fluid from your body than a regular bath. Rehydrate before and after, especially if you're planning more than one soak in a day.
Glasses or contact lens case
1
Glasses fog up and aren't practical to wear in the water. A case keeps them safe in your locker instead of balanced on the edge of the tub where they can slip in.
Cooling towel or handheld fan
1
Your body stays warm for a while after a hot soak. A cooling towel or small fan helps you cool down gradually in the changing room rather than walking straight into cold air conditioning.
Selecting ryokan assumes your hotel supplies a bath towel and toiletries; day-trip mode adds them back onto the list for a public bathhouse or day-use facility.
Set adult and child counts and the per-person items — towels, hair ties, spare clothes — recalculate for your whole travel group automatically.
The tattoo cover sticker, the cooling towel, and the private bath confirmation are marked optional with a note on when each earns its place — leave out whatever doesn't match your plans.
Send the link before you travel and everyone opens the same list — whether staying at the ryokan or meeting for a day-trip soak, each check-off appears for the rest of the group in real time.
No, not at a traditional onsen — bathing is done nude, and swimwear generally isn't allowed in the shared water. Baths are separated by gender, and a small towel is fine to carry for modesty on the walk over, but it comes off before you get in. A growing number of resort-style facilities, mixed-bathing pool areas, and onsen theme parks are swimsuit-required exceptions, so check the specific facility if that matters to you.
Wash and rinse completely at the washing stations first — every facility has them, usually a low stool, a handheld shower, and shampoo and soap. This isn't a quick rinse; it's a full wash, the same as before a bath at home. Skipping it is one of the most noticeable etiquette mistakes a first-timer can make, since the bathing water is shared by everyone after you.
Keep it out of the water entirely. Most bathers fold it and rest it on top of their head or set it on the edge of the tub while soaking. It's there for modesty on the way to the bath and for drying off afterward, not for washing or for use in the water itself.
No. Phones and cameras stay out of the bathing area completely, even for a quick photo of an empty room — it's considered a serious privacy breach at a facility where everyone is undressed. Leave yours locked in your changing-room locker or a robe pocket, and seal it in a waterproof pouch if you're worried about the humidity.
Most traditional baths are gender-separated, with men's and women's sides clearly marked and sometimes swapped between morning and evening. Very young children often bathe with a parent on either side. If you'd rather bathe as a family or a couple, look for a facility offering a private or family bath (kashikiri-buro), usually booked in a time slot for an extra fee.
It depends entirely on the facility, so don't assume either way. Some traditional onsens still refuse entry to anyone with visible tattoos, many now allow a cover sticker or patch, and a growing number don't restrict tattoos at all. Check the specific facility's policy before you go, or book a private or family bath to sidestep the question entirely.
Hot water bathing raises your heart rate and can cause dizziness or dehydration faster than a regular bath, and alcohol makes both worse — most facilities post a warning against bathing soon after drinking for this reason. If you have a heart condition, are pregnant, or have another health concern, check with a doctor before you go and treat any posted warnings at the facility as genuine, not just formality.
A day-use onsen or public bathhouse typically runs somewhere in the range of a few hundred to a couple thousand yen for entry, with ryokan stays including the bath in the room rate. Bring cash regardless — entrance fees, locker deposits, and towel or soap rental are still cash-only at plenty of facilities, especially smaller and more rural ones.
Fifteen to twenty minutes per soak is the usual guideline, with a break in between if you're going back in. Bathing more than once a day is completely normal, especially at a ryokan — before dinner and again in the morning is a common pattern — just rehydrate between soaks and get out sooner if you feel lightheaded.
Toggle between a ryokan stay and a day-trip visit and the list adjusts — the bath towel and toiletries only appear when your facility won't already supply them.
Beyond a generic packing list — the small towel that never touches the water, a hair tie, and a sealed pouch for your phone, each with the reason why it matters.
Set your group size and everyone opens the same list — check-offs show up for the whole group in real time, so a shared item like the toiletries isn't packed twice or missed entirely.
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