Thermos Carrier With Strap

E's school sent us notice for the field trip: wear school uniform + bring bottles with strap. Well, uniform can be fixed by doing an extra load of laundry, but bottle, ummm... E has 4 thermos bought by Grandma and Papa, they are perfect size and all in his favorite car and spiderman patterns, but none of them has strap...But I really don't want to buy an extra bottle just for this trip. Well, as a sewing mom, that is not a hard thing to fix though :p
Material is from a friend, she gave me several embroidery patterns.And I sewed him a little name tag too.