The WONDBORN portable breast milk cooler keeps your milk fresh and safe for working moms on the go. Advanced vacuum insulation maintains 40°F for over 24 hours, meeting TSA travel standards. Four reusable ice rings cool milk quickly after pumping while preserving nutrients. Two 11-ounce bottles store up to 22 ounces in separate compartments to prevent spoilage. Detachable ice rings lighten your load for short trips and work with both pre-frozen rings and ice cubes. One-hand flip-top operation with a lift-ring bottle prevents leaks. Made from food-grade, BPA-free materials, this cooler eliminates refrigeration worries during commutes and travel, giving you peace of mind that your baby gets quality breast milk every time.