Since you're trading both for the same purpose, selling for Keys / Promos, and the only difference is a discount for the bundle, I don't see why you can't just open only one trade with both Unusuals on the left side and a Bud (and a Key and Bill's ...) on the right side.
The different prices and the discount can be set in the trade notes.

I really don't see any advantage for you by listing multiple times either. It won't increase your chances to sell your unusuals, imho.
And I have no doubt that people will offer an a single unusual in a bundle trade anyway. And then you would have to manage you C/O across trades (assuming you also take offers and your prices are a B/O)

Originally posted by Rico Lambrini:

You should get a consultant job, after a fine brain reconstruction.

lol, I'm not the one that got banned for not using his brain.

Again, use common sense and you should be fine.
No one will give you a hard boundary you can quote to defend your trade not being a troll trade / shark attempt.

Originally posted by Kybomb!(Buy/Sell Mini-Games):

That's for money./: And I don't see a heart in the top, right hand coner.

I guess you didn't read the whole page then...

The icons in the top, right corner left of your profile picture unfortunately do not show if your browser window is too narrow.

We don't know yet.
The wiki says that some miscs and tools are tradable from F2P, but most drops are not.

But it will very likely be tradable when you decide to upgrade to premium at any time after March 1st, should it not be tradable from F2P then.
That would imply that the Tux needs to be worth more than 2.5 Keys to gain profit from farming it.

Originally posted by Rico Lambrini:

Also, that 200% thing is not on all trade rules.

From that comment I take it that you know very well what a Vintage Scrap is worth. That makes it an attempt to shark, which is even worse.

Even if you did not know, why did you open the same trade? If it was in dispute, you'd have to wait for a "that was a mistake, you're good" statement by a mod. Doing so despite such a statement was not a very smart move, to put it mildly.

seriously? http://www.tf2outpost.com/trade/8808662

Originally posted by Rico Lambrini:

You are making up numbers.

You yourself have a B/O of 3.6 for both your items combined.
The Vintage Scrap is a very rare collector item. As there is no Vintage Scrap for sale right now, I cant show you on OP what it's worth. But past sales have determined the price to be around 16 buds[backpack.tf].

The rules are "Trade Rule #6" and "common sense".

Here we go again. Just to avoid further confusion:
Asking to pay 80% for something is not the same as asking 80% off something, which would be asking to pay only 20% of the common price.

The former is ok, the latter can be reported.

You just need to read: "Troll wishlist"

In case you still don't get it: The Vintage Scrap Metal, worth both your hats combined many times over, is the reason.