Veracrypt Containers

I would like inputs on what is the optimal size of a veracrypt container which would not make it look suspicious for someone inspecting my system.

I think for any knowledgeable person it will be easy to identify but if for normal people, you can keep it anywhere below 500MB - 1 GB so that you can say the partition is a system partition.

I guess there is no fooling a guys(s) who knows his stuff. Hidden containers would be a better option.