Please rethink the firemaking materials.

Most people die from hypothermia when the air temperature is 32-50ºF. When it's colder than that, they usually have suitable clothing. A 40ºF air temperature with a breeze of 5 mph = 36ºF, a breeze of 10 mph = 34ºF, wind of 15 mph = 32ºF, and a wind of 20 mph = 30ºF.

If the ambiant air temperature was 35F, those figures drop to 31ºF, 27ºF, 25ºF, and 24ºF.

And cold air is like water in that it settles in the low places, like a small valley or a canyon. Being trapped in a cold spot can be the death of you.

Just for fun, go to a spot similar to where you might end up, and spend the night (not in summer -- make it interesting). You might end up revising what you think you'll need.