I have a Google spreadsheet I’ve used for the past three and a half years when travelling. It has everything I regularly need on multi-day trips, space for extra items to add on specific trips, and checkboxes.
To pack, I lay out my suitcase and backpack, and throw things into them while referring to my list. Once everything on the spreadsheet is ticked off, I zip up my suitcases and am ready to go.
It’s very straightforward. You can add or remove items to the spreadsheet over time, and just clear off the extra items for each new trip.
Here’s my spreadsheet. You probably don’t need exactly the same things as me, so feel free to save your own copy and change the lists. Happy trails, friends.