Question

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up?

Answer 1

The phase of matter you are describing is a liquid. In a liquid, the particles are held together by intermolecular forces, but they are not fixed in place and can flow past one another. This allows liquids to take the shape of their container and to fill it from the bottom up due to gravity.