A film kit for altitude reduces by subtraction. Cold air taxes batteries; condensation taxes glass; thin air taxes stamina. After the excess is paid for, what remains is short: one camera body, two lenses, spare power beyond estimate, a cloth, tape, gloves thin enough to feel switches. Nothing in the bag may require menus or ceremony. Controls must work at the edge of numb fingers, dials operable without looking. The lesson of altitude packing is that capability is not carried in volume. A smaller kit, chosen honestly, records more because it moves easier. What a mountain kit reduces to is simple: what works cold, what works fast, what works tired.