Here is container to me:
The flower. Yes. It is the most beautiful container to me.
What could be inside this very beautiful container? We see the petals outside. Inside, we see the pistil and stamen. The stamen contains the anther and filament. Inside the pistil we find the stigma, style, ovary and ovule.
The stamen is the male part of the plant which produces the pollen. The pistil is the female part of the plant which produces fruit once pollination has taken place in the ovary.
Oh container! You challenged me to the point of googling up for my elementary science on flower.