Some of us like to keep certain items we find for future use. Maybe you haven’t hit the right lvl to use it or you just like the item so much you don't want to throw it away, even if your not using it.
Some ideas:
1. A tab in the main menu where the items you store is listed. Simple it works but a bit boring. You click on the item in your inventory and click on a move to storage button.
2. This would be really sweet. You get your own house where you can store items in chests and you can on special places hang weapons on the walls. This could open up a new way to earn money for you guys witch I think you deserve for bringing us this awesome game. You could buy new content for your house to design and decorate it and to make this interesting for the player you should be able to invite people to your house. Maybe you even could upgrade your house to a castle in the end :P
Just letting out some of my ideas even if the can be a bit over kill :p