I got 3 bags the smallest is a 25Lfor a take everywhere or few days. has my most used or needed things.
The second is 45L for 4 or 5 days more stuff add all from the 25L.
The third is 85L is everything forever camp like tent sleeping bag waster storage axe shovel bigger cooking set stove and everything from the other bag.

I got a 25 L bag with a 100 oz camel bak a sawyer filter milti tools fire flash lite ect a poncho with a liner For food a few days worth no cook food or some hot water a fuel tab stove and tabs.