Hegen'S Revolutionary, Practical And Multifunctional 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" (Squareround) 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 Snapon Interconnecting Buttons For Smart Organisation. The Containers' Wide Mouth And Smooth Lines With No Hidden Ridges Makes For Fussfree Cleaning As Well. A Hegen Is Both Aesthetically Pleasing And Inherently Functional •Easy Storage System •Allows Multiple Containers To Bind Together Effortlessly, Instantly Converting Bottles Into An Organised Milk Storage System. •Stackable For Efficient Space Utilisation •Hegen'S Unique "Sqround" (Squareround) Shaped Bottles Allows For Space Efficient Stacking And Storage, Optimising The Space In Your Freezer. •Airtight •Airtight Lids Ensure That Your Precious Breastmilk Does Not Come Into Contact With Air Unnecessarily, Protecting Precious Nutrients From Oxidation And Keeping Breastmilk Fresh.