Thermos for milk?

Kim

So our son will be 12 months the end of July and I’m trying to plan for daycare and milk. He goes to a home daycare and she keeps formula and water there what we provide but since we’ll be switching to milk I figured it would be easier to send him with milk for the day in a thermos but idk if that is the better plan. I don’t want to send a carton of milk or anything since he only goes 3 days out of the week and the days aren’t in a row.

Anyone have any recommendations for straw thermoses and if they think that’s a good idea?