Power & phone

Your phone is your map, translator and train ticket. Keep it charged, and know Japan's rules for power banks on planes.

Anker Nano Power Bank (10,000mAh, 45W, built-in cable)

Navigation, translation and photos can drain a phone by early afternoon. A 10,000mAh bank with its own cable means one less thing to forget.

10,000mAh capacity, 45W max output
Built-in retractable USB-C cable
Listed weight 8.2 oz

Keep in mind: Power banks must go in your carry-on, never in checked bags. Since July 8, 2025, Japanese airlines also ask you not to put them in the overhead bin and to keep them where you can see them. Foreign airlines set their own rules.

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Power & phone

Anker 735 Charger (Nano II 65W, 3 ports)

One small charger for a phone, power bank and camera at night. Japan uses the same two-flat-pin plug shape as the US, so most US travelers won't need an adapter.

65W max from a single port
Three ports (USB-C and USB-A)
Foldable prongs

Keep in mind: Japan runs at 100V. Check that any charger you bring is rated for 100 to 240V input (most modern USB chargers are), and skip hair tools rated only for 120V.

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Power & phone

JOTO Waterproof Phone Pouch (2 pack)

Hakone Yunessun's swimsuit area is cashless inside, and the operator itself recommends a waterproof phone case. A pouch on a lanyard keeps your phone dry around the pools.

IPX8-rated pouch
Lanyard included
Fits phones up to about 7 inches

Keep in mind: Phones and cameras are never allowed in the nude bathing areas of an onsen. Leave the pouch in your locker there.

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Guides that use this gear

Kumano · Wakayama

Walking the Kumano Kodo after a stroke: what I packed and what I'd change

Demanding

Hongu · Shingu · Nachi

Kumano Sanzan by train and bus: Hongu, Hayatama, Nachi and Katsuura

Moderate

Osaka

Osaka Castle without the hard parts: an easier way through

Gentle

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