The b.box Essential Baby Bottle gives parents the freedom and convenience to feed baby anywhere, anytime without the mess, the fuss, and contamination risk. For optimum nutrition, makers of infant formula recommend that powder and fresh water be mixed at time of feeding. The b.box Essential Baby Bottle design allows the parent to pre-assemble the sterilised parts with a measured amount of powdered formula and clean water, keeping them separated and sealed. At feeding time, the plunger is manually pushed upwards to combine the powder and the water in the bottle, creating freshly mixed liquid formula ready for instant feeding.