Medicool brand foam insulated container with 2 cold packs, holds 2 vials. (Caution - keep insulin cold, never freeze!)
Also, 3 Frio cooling packs (large, medium and small). Inserts get soaked in water for several minutes to expand. The gel beads act as an effective insulator against heat and cold, so you can keep insulin at the proper storage temperature without needing refrigeration for day trips.