I used this for milk to go container everytime we made trips or going to sleep.  The milk stays fresh for up to 24 hours so I don't have issue getting the milk I bring for my son to spoil.  Also use this as milk container that I bring to the room for easy access so i don't have to go back in and out the room to get milk for my son when he wake up at night.  No leak.  And it sealed really good.  I so loved this contigo