I don't think the backpack would do much in the sense of helping you dupe.
is it possible to dupe with the backpack? i mean like the old dupe but with backpack instead of vault
What if it were possible to trade with yourself. Now that would be helpful lol.
I believe @atenzor meant having the same account logged in twice, rather than having two different accounts logged in at the same time.
@SlamDrag
first, you said: "What if it were possible to trade with yourself. Now that would be helpful lol."
then, you answer your own question with: "My friend uses his kong account as a storage area
for his stuff and his steam account as his main. Thus it is possible."
Now, from this, we can conclude two things: that yes, indeed, it is POSSIBLE to trade between your "mule" and
your "main" or however you want to interpret two accounts owned by same person, which is normal trading,
which was here for a LONG time in this game, I hope you didn't just discover it NOW?
and the second thing is if you meant, but you didn't complete your sentence in that case, that is it possible
to somehow "dupe" with trading system by itself (between two accounts owned by one person). In which case,
so far, it's not possible.