Is it more difficult to make an airtight container or a watertight container ?

Answer 1

Airtight is more difficult because the air molecules are much smaller than the water molecules.

For example, Gortex fabric will breathe, but is water-repellent.

Answer 2

it is more difficult to make an airtight container as the forces of attraction between the particles of air is less than the forces of attraction between the particles of water and the size of air particles is also smaller than water particles
so there is more chance of air to leak out