Load them on your usb and play them from your usb instead of replacing your xbox360 hard drive characters so you will have 2 different accounts under one gamer tag. There is a way to merge character files with your character files through Horizon or 360 Rev. so you might have to search the forum or a search engine to find the method. Sure it is pretty easy... Could always use another gamertag with a second controller and drop the items in a game with your main account if you just want the items. I dunno what you are trying to accomplish here to be honest...
