Storage Box in Super Mario RPG. The guide explains the location and usage of the Storage Box. Use this as a reference when you are searching for one.
Table of Contents
Storage Box Location
Inside Mario's House

The Storage Box is inside Mario's House. Check the box in the bottom-left of the room.
How to Use the Storage Box
Items Exceeding the Limit are Automatically Stored

Each item has a maximum carry limit*, and any items that exceed this limit during your adventure are automatically stored in the Storage Box.
Carry Limits Differ by Mode
In Breezy mode, the item carry limit is higher than in Normal mode. When switching from Breezy to Normal mode, any excess items that exceed the limit will be automatically stored in the Storage Box.
Check the Box to Retrieve Items

By checking the Storage Box in Mario's House, you can freely retrieve stored items.
Use X Button Refill to the Maximum

When retrieving items, pressing the X button will refill them all at once up to the maximum carry limit.