The pack is the multiplier: every gram lives there for every day. Fit and load order matter as much as weight.
Recovery is the fuel for tomorrow's kilometres. The sleep trio is chosen as a system for the coldest night forecast.
Food is the heaviest consumable. Count calories per person per day, then build a menu with no cooking drama.
Between the reliable sources is the real distance. Carry to the longest gap, treat everything else.
The multi-day failure rate is highest at the toes. The kit is useless unless the routine runs daily.
The small kit is what gets fumbled when everyone is tired. It packs the same way every morning.