キットカット
Kit Kat (Japan flavours)
All Japan
Japan has over 400 Kit Kat flavours — matcha, sakura, sake, wasabi, purple sweet potato. Each region has exclusive flavours only sold locally. They're inexpensive, well-packaged, and universally loved.
Where to buy
Convenience stores (7-Eleven, Lawson), airports, train station souvenir shops
Why it's worth it
Light, cheap, and impossible to get abroad. Buy the regional exclusives — they double as local curiosities.