Hegen's revolutionary, practical and multi-functional designs represent a quantum leap in baby feeding. Simply swap lids to feed and store in a single container with no wasteful transfer of milk necessary, making every drop count! Hegen's ergonomic space-efficient shape makes the best use of space while sealing in nutrients - the unique "Sqround" (square-round) shape stackable containers nestle together when empty and stack neatly when filled, leaving you with more room for your daily essentials. Our breastmilk container storage lids also feature snap-on interconnecting buttons for smart organisation. The containers' wide mouth and smooth lines with no hidden ridges makes for fuss-free cleaning as well. A Hegen is both aesthetically pleasing and inherently functional!