Inventory capacity is most valuable when space pressure interrupts several parts of the game at once.
Measure how often space ends a trip early
If gathering, trading and exploration all stop because of capacity, inventory may be the highest-value upgrade.
Protect space for core resources
Extra capacity matters most when it lets travel essentials and useful discoveries coexist.
Compare capacity with other bottlenecks
If travel or hazard exposure is the real problem, inventory may not be the first upgrade to solve.
Keep the larger inventory organized
More slots only help if clutter does not expand to fill them immediately.