im heading back to work soon..i would like to know how many ice packs is sufficient to safely transport chilled ebm back home? my travelling time only max below 1 hour from fridge to fridge...i got the daiso ice packs and container type. how do i know the temperature is optimum? for cooler bag, is the daiso kind sufficient if i put ice block and ice packs? do i need to wrap the ice packs around each individual bottles? thanks in advance!