A separate, outer write-on tab allows the date and amount to be written clearly without any risk of ink contamination and puncturing the bag. Lansinoh Breastmilk Storage Bags are designed to lay flat for efficient storage and thawing and come pre-sterilized for your convenience. Benefits and Features:Ideal for storing !#!amp!*! freezing breastmilkReinforced side seamsConvenient pour spoutPatented double Click ‘n’ Secure™ sealBags lay flat for efficient storage and thawingStrongest and largest bag availableBPA and BPS Free