Originally Posted by
paperwastage
the really major stations might have manned counters for luggage storage, though it may not be in a convenient location or require waiting in line.
if you have coins or suica, and you're willing to believe the live locker availability of this page for Tokyo metro stations
https://metro.akilocker.biz/index.html?lgId=tokyometro
There used to be a page for Tokyo JR stations , but it's gone?
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Thanks! Looks like things haven’t changed that much; relatively easy to find small lockers, with large and extra large lockers being more elusive.
What does seem to have changed is that there are apps and ventures that offer alternatives and solutions. I guess it just needs some head space. Not one of my strengths!