[MunchkinMan]

Some points:

1. Carried Items are Items in play, unused or otherwise. You indicate some understanding of this by describing both sections for Items as carried Items. Since you can only carry 1 Big Item, that means you can only ever have one in play without some other card allowing you to have more.
2. You can not play new Items to the table if they are not one-shots during combat, and even then, one-shots can only be played from the hand during combat to actively use them for that combat. It could be inferred that you are stating that you can only play Items to the table (one-shots and "normal" Items) during combat.
3. I'm not sure what you mean by having "the same title in play." You might want to clarify that.