It is quite possible to purchase cabinets, chests, safes and the like, lockable or otherwise, within the game. Wearable and reliable carriably containers are yet to be done.
Not only is size an issue (many people have been very lazy while creating objects and neglected to size them), but for wearable containers we have to develop some code for game balance. If we simply made wearable containers, players would start putting -everything- in them rendering 'steal' a complete waste of code and severely hurting theif characters.
Those wooden boxes are bad enough, -every- single one of you who owns a wooden box is guilty of loading -ridiculous- amounts of stuff into them... Don't be surprised if one day in the future you start taking stuff out and suddenly it won't fit back in.