Let say I can make the container or a bottle vacuum inside, what will actually inside? If this is not vacuum, we can say that it is fill with air, but if we make it vacuum... Will the bottle or container, reduce their size? Thanks.
In reality the small fraction of the air you hadn't managed to remove.
Ignoring engineering details and with a perfect vacuum there would still be a sea of infrared photons emitted from the walls and of course there is an ever present stream of neutrinos from the sun and space sources which are constantly streaming through everything.
But even if you had a perfect vacuum, at absolute zero, in space, an infinite distance from any stars (!) there would be quantum effects which caused virtual particle pairs to be created out of nothing