I already have a full-sized hand luggage and I could probably squeeze the bottles in. It would be sealed in a vacuumed tax-free bag.
If you purchased it at the airport and with the relevant closed bag etc I cannot see why they would not allow it, I very often carry all sorts of hotels of wine and perfumes as carry on that I bought at tax free during lay overs.
For example SHA- HK - HCM I never have problems buying things in HK and bring
SHA - SGP - MEL, same thing
SHA - ARN - NYC same thing
I am trying to think of a place where I have been denied but I cant