I bought 2 of the 20 oz hydroflasks at the overland expo. Now I wont use anything else. They are simply amazing. I am sure the larger one will work just as well. Here in AZ we are trying to keep things cool, instead of hot, but the priciple is the same (heat transfer). We can use the same ice, literally, all day in the hydroflask, even when hard sun on them at times. Love 'em.