I am looking for a smallish (8-10 oz) insulated stainless steel drink bottle for sending milk to school in my kids' lunchboxes. I got the Klean Kanteen 12 oz insulated bottle and it's great, except it's bigger than I need. My kids only drink about 8 oz of milk anyway, and it takes up half the lunchbox. I saw the Thermos 10 oz- does anyone know if it is any smaller on the outside than the Klean Kanteen? Or have other ideas on sending milk to school?