Detailed description of the feature

The small felt about right. For that point in progression it was a bit of effort to get a bit of storage.
The cost difference between medium and large doesn't make medium a useful stop at all, just go straight to large.
And large is WAAAY cheap for the amount of storage you get.
I would suggest maybe medium being made from 4 smalls and large from 4 mediums.
That way each step up is a fair bit more effort.

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