"Lansinoh ""Breast Milk"" storage bags are the #1 selling milk bags for breastfeeding in the US. Lansinoh ""Breast Milk"" storage bags are ideal for storing and freezing ""Breast Milk"". ""Breast Milk"" bag storage can take place in the fridge or freezer. You can pump directly into the bags using a Lansinoh pump. If you have another pump, attach pump adapters to the expression set and then pump directly into bags. Lansinoh pump adapters sold separately. Lansinoh milk storage bags come pre-sterilized and have a patented double Click 'n' Secure seal to prevent leakage. With reinforced side seals and double-sealed gusset, Lansinoh bags are the strongest ""Breast Milk"" storage bags available. Gender: unisex."