I don’t have the exact measurements, unfortunately — something I hope to fix on my next upcoming trip — but I can say that the small one does not accommodate a full-size suitcase. However, if you mean Osaka Station (not Shin-Osaka Station, often confused and one metro stop from each other), then I can say they have all sorts of sizes, including for large suitcases. At Shin-Osaka, which is what this post is referring to, there is also a luggage storage room which will take anything at all.
What is the dimensions of the lockers at the Osaka station?
I don’t have the exact measurements, unfortunately — something I hope to fix on my next upcoming trip — but I can say that the small one does not accommodate a full-size suitcase. However, if you mean Osaka Station (not Shin-Osaka Station, often confused and one metro stop from each other), then I can say they have all sorts of sizes, including for large suitcases. At Shin-Osaka, which is what this post is referring to, there is also a luggage storage room which will take anything at all.