If you take the same kind of trip more than once, stop rebuilding the list from scratch every time.
Build once, reuse forever
Save any packing list as a template, "city break", "hiking trip", "work conference", whatever pattern you travel in. Apply it to a new trip in one tap and adjust from there.
Good for the whole family
Templates work the same for every trip type: the weekend bag, the two-week holiday, the recurring work trip. Build it once per pattern.