Ship 70 to 150 ounces of breastmilk in the Mini Shipping Kit! Helping moms ship their breast milk since 2017! These styrofoam kits are made to transport breastmilk. Ice sheets and shipping instructions are provided within the kit. You can ship, drive, carry on an airplane or check it! Kits can help maintain breastmilk frozen up to 48 hours but it would be best to ship or travel up to 24 hours in summer months.