Please, order the inventory.
Set predefined spaces for each item and add the options to stack up objects and to sort them otherwise it is going to be a hell of a mess if everybody drops items randomly into it. Double the mess you don't let automatically stack up... So you don't find 10 times the same item spread all over the inventory!
It's going to be a hell of a mess out there, specially in LiF MMO!
Please, take care of it