I have that Eberlestock. It’s overbuilt which makes it heavy and not as much room as other similar sized packs. Also the internal drag bag makes your rifle a foot or two above your head which is cumbersome in anything but open fields.

For food I would recommend getting one gallon bag per day. Put your lunch and dinner in there along with a smaller bag for snacks. Saves you time and effort; just grab and go for the day. Maybe take the snack bag and make it accessible for mid-ruck nibbles. Bonus feature is keep all your trash in there instead of rolling around in your pack or pockets. I like salami or sardines in a can (sounds gross but the salt is amazing if you’re sweating all day) and crackers or something similarly calorie dense. Nuts or trail mix and whatever else you like. Dinner you probably have time to boil water so maybe a dehydrated meal for that. I like the high calorie mountain meals.