So Easy Storage Trays are specially designed to simplify feedings and reduce waste of baby food or breast milk. Making baby food in quantity once or twice a week is easy and convenient and the Fresh Baby Food Trays make it's even easier.How they work: Simply pour expressed breast milk or pureed baby food in the food safe trays, put them in the freezer and use what you need - when you need it. The neat thing about the trays is that they have covers, so there are no spills, no mess, and no odors. Each So Easy Tray makes 12 pre-portioned servings (cube size varies from ounce to 1 ounce). Breast milk cubes are the perfect answer to many situations. Since cubes defrost quickly, they are great for topping-off bottles, thinning baby food, or just adding a little extra nutrition to your baby's cereal. Thaw what you need - convenience for Mom, Dad, or any caregiver.Making baby food introduces your little one to the flavors of real food and will save you money. Using the tried n' true ice cube tray method of making baby food, it will take only 30 minutes per week. Cover, stack, and freeze it's so easy!The heavy duty construction allows quick release of the frozen food cubes. Simply remove the tray from the freezer, run warm water on the back of the tray, remove the cover, twist the tray and the cubes will out. And they are dishwasher-safe, so clean up is a breeze.Material Made in USA #4 LDPE (Low Density Polyethylene) with a biodegradable additive; #2 HDPE (High Density Polyethylene) with a biodegradable additive; FDA-approved food-safe, BP-A, PVC, Phthlates and Plasticizer-Free. Tested to biodegrade 10% in 6 months using ASTMD5511 test. Note: Biodegradable additive does not affect shelf life of trays. Very specific landfill conditions are required to begin the degradation process.