Material: Made from polypropylene, BPA Free, sturdy and leak-resistant. DIMENSIONS: 4.5" x 2" x 5.7". Effective：Contoured shape holds bottles upright and fits around breastmilk bottles perfectly. Stay breastmilk cold for a long time. Easy to use: Firstly, Add a maximum Capacity of 310ml(10.5 Oz) water into the cooler bottle up to the standard line. Then wait for 15 minutes to make the powder solidify. Finally, put into the refrigerator about 8-12 hours before use. NOTE: Please don't throw away the powder. Keep water for next time use. Pack of 2: Use one take to work, Leave other one get completely frozen in the refrigerator, so that you can stay frozen in the cooler bag for the whole day. Perfect for working moms, picnic, long-time transport. Not only can be used for breastmilk frozen, but also as the can freezer. Teamoy Breastmilk Ice Pack(Pack of 2), Bottle Ice Packs for Breastmilk Storage and Breastfeeding Working Mom