Build a packing checklist from the trip type, length, expected weather and planned activities, then print it or copy it.
Quantities for clothing scale with the number of days, with a laundry option that caps repeat items for longer trips. Trip type and weather add the items that are most commonly forgotten for that kind of travel, such as chargers, swimwear or a warm layer. The list is a starting point: medication, documents and valuables should always be checked against personal needs and current travel rules.
How does the laundry option change the list? With laundry available, repeat clothing is capped at about four days of outfits plus travel clothes, instead of one full set per day for the whole trip.
Can the list be saved? Use Print / save as PDF to keep a copy, or Copy list to paste it into a notes app. Checking items off on screen does not save between visits.
Are travel documents included? A documents section is always included as a reminder. Which documents are required depends on the destination and current rules, so verify those separately before travelling.