In the office kitchen, the pouch of milk in the micro-fridge
attached to the coffee maker does not end well. It ends with
spluttering and spitting, as the flexible hose which is pushed
down into it finds the milk remnant puddle too shallow.
The micro-fridge should be higher up, and the milk
vessel
should hang in it upside down, connected to the milk hose with
a Froth-Milk Vessel Inversion Adapter.
For a plastic bottle of milk, this could be a threaded, washable
silicone sphincter. The bottle would be supported in an
adjustable clamp.
For milk pouches, such as we have, (and for tetra-paks), it
would be almost impossible to mechanically attach a device
that would both make a seal and also be easy to detach when
changing the pouch, so the way forward would be to empty the
whole milk pouch into a purpose-built downward-dispensing bag
like those used in hospitals with intravenous drips.