How do I fire a Giftapult?

So I saw that Giftapults can be crafted cheaply, and I thought I'd use this as a nice way to get rid of some items I'm never going to use that might be valuable to others (no, not crates). I crafted a Giftapult and used it on another item to make a Loaded Giftapult.

Now I don't see how to use it.

• Clicking on it in my backpack in TF2 gives me a menu which allows me to rename or delete it.

• Some signs point to it being an Action Item, but when I try to equip it in the Action slot it's not in the valid items list, and in the all-items view it says "( Item cannot be used by this class. )". I tried all nine classes; same result.

I've tried all this while both connected to a server and not.

The Loaded Giftapult is marked "( Not Tradable )" but that seems to be normal.