After putting this thread up I ended up going to our local hardware store and being it was just before fathers day they had both the 1.8 and 1 litre on sale I purchased the 1.8 they said I could take back and change it if I got home and changed my mind on the size but ended up getting the smaller one as well, have used them many times since getting them and they stay hot for a long time have not had any leaking. They are thermos café ones by thermos. We usually just take them and the coffee sachets, then don't need to carry milk as well. Take them on day trips in the car and to the footy.