This portable USB Milk‑Water Warmer Bag features a soft, tear‑resistant fabric outer shell and a 5‑layer insulated interior sleeve. Powered via USB (5V/2A), it offers three heat settings: approximately 40 °C, 50 °C, and 60 °C—adjustable with a long-press button. The universal design accommodates most 55–75 mm diameter bottles, including glass, plastic, or breastmilk containers. A handy lanyard lets you hang it on strollers or diaper bags, perfect for outings or late-night feeds. Lightweight and compact (about 30 × 13.5 cm), it’s easy to clean and ideal for busy parents needing on-the-go warmth control.