Subway stations in tokyo consist of endless pathways, some include stairs (and no elevators). Planning to use the subway with luggage in hand is not a good idea.
[header] How to prepare a packing checklist for tokyo [title] Think light and small-compared with westerners, japanese people tend to travel with smaller size luggage. [step] As a result, there usually isn't a wide space to store large luggage in trains (including the bullet train). Coin lockers in subway stations aren't large enough to hold big suitcases either.