Ideal pack weight is zero.

After that you have to work it out for yourself.
How cold, how wet, hHow hungry are you willing to be in order to not carry the stuff to keep you warm, dry and fed?

Of course if you're hiking thru civilization you might not have to carry food and cooking gear. But you'll need to carry money. And think ahead for food stores/restaurants etc. Might be many miles between convenience stores.

I suggest you do a test hike on a weekend of maybe 5 or 10 miles out one day and 5 or 10 back and see how it goes.

Even Lewis & Clark didn't do a full first day deliberately so that they could shake out the problems.