>>2822816>Maybe I carry too much food and clothes.Probably, I did the same when I started.
With wool or synthetics, you can get by with 3 sets, just drying them on the back of the pack over the day, and keeping one in reserve in case of rain.
With food, volume varies massively. My go to is oatmeal, dehydrated soups and ramen noodles, simply because those are cheap and available in the supermarket here, while other freezedried foods require mailorder and cost ten times as much. Bacon, cheese and crackers are also dense (but heavier), but if you carry fruit, vegetables ore the like, it's going to have more volume. Still shouldn't be nearly as much, though - my regular food for an entire week, including plenty of fruit, milk and yogurt that's 90% water and that I'd never bring on a hike, is only around 25l.
I never measured the volume of my hiking food, but a two-days supply + cooking gear fits easily into a US sustainment pouch, which has 2,5l, I think. My standard setup is having the sleeping bag(s) and the tarp in the main compartement of the pack, clothes in two of the MRE-sized pouches on the outside, and food in sustainment pouches on the sides. Then the sleeping mat on top or under the flap, tent pegs and ropes in mag pouches, and the other stuff (toilet paper, folding shovel, light, FAK etc) spread out over whatever pouches I have free.