ONE HAND TO POUR, THE OTHER TO HOLD YOUR BABY: Easily fill these breast milk storage bags through the wide top opening and pour out through the side spout - all one-handed, no spills, no cross-contamination. LEAKPROOF, BECAUSE EVERY DROP MATTERS: The Medela breastmilk bags feature a double-layer and double-zipper seal for added leak protection, giving you peace of mind when storing milk for later. 98% of moms agree* these breastmilk storage bags are leakproof. PROTECT THE NUTRIENTS YOU WORKED FOR: The ultra-thick BPA-free double layer creates a better* oxygen barrier that protects the nutrients in your breast milk through the refrigerating, freezing and thawing process - so your baby still gets every nutrient. A MILK STASH THAT STAYS ORGANIZED: Once you are done, use the dedicated labeling area to record the date, time of day, and amount. Lay these breast milk storage bags flat to stack and maximize freezer space, or stand them upright in the fridge, so your hard-earned milk is always easy to find, grab, and pour. MADE CLEAN, READY TO USE: Each Medela breastmilk storage bag is made with BPA-free food grade materials, and arrives sanitized in a resealable pouch - no boiling, no prep. Just pump, pour, seal, and store. 200 bags, 7 oz / 210 ml each, clean and safe for your baby. BACKED BY THE BRAND HOSPITALS TRUST: Medela is the #1 breast pump brand used in hospitals, with 60+ years of breastfeeding research. Trusted by millions of moms like you.