This handy little unit carries 3 pre-measured portions of milk powder in separate compartments. When you're ready to feed, just open the spout and pour the powder into a bottle of pre-boiled cooled water as normal. Infant formula manufacturers recommend that fresh feeds be made up when needed, so there's no chance of the milk going off while you're out and about. The inner section can also be removed to use as a separate bowl or container. BPA free.