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Step one: sort by where items live
Start by grouping items by where they will be on the trip rather than by category alone: on your body on the slope, in your daypack, in the main bag, and in the car or airport carry-on. Worked example: a family of four planning a long weekend lists goggles, helmet and neck gaiter under on-slope, spare gloves and sunscreen under daypack, and chargers under carry-on. This arrangement mirrors how people actually pack and unpack, so missing items become obvious at the moment they would be forgotten, not after arrival at the lodge.
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Step two: mark who owns each item
Next, assign every line to a person, and flag items that can be rented instead of carried. In the family example, parents own their own boots because fit matters, while children's skis and helmets are marked as rental, with a note to confirm sizes in advance. Shared items such as a first-aid kit, snacks and a small tool for bindings get a single named owner so no one assumes someone else packed them. Ownership turns a long list into short personal lists, which are quicker to check off and easier to hand to older children.
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Step three: add a pre-departure check
Finally, add a short check that runs the night before leaving, separate from the main list. For the family weekend it has five questions: are boots dry, are batteries charged, are lift tickets or passes accessible, are layers matched to the forecast, and is anything left in the dryer or by the door. Keep the check to a single screen or card so it actually gets read. After the trip, note two items that were missing or unused, and edit the list. Over a season, those small edits turn a generic template into a personal system.