Inventory capacity upgrades are found in E.R.C. crates and some dungeons; crates need an E.R.C. activator pen from the current level.
Inventory upgrades are found inside E.R.C. crates or lying on tables in some dungeons. To open an E.R.C. crate, use an E.R.C. activator pen found elsewhere in the level.
When a crate will not open, do not spend time looking for a universal keypad code. Search the current level for the activator pen, then return to the crate. Frogwares says the pen can appear in different places on a level, so this answer does not invent one fixed location that would be wrong outside a specific chapter.
For capacity itself, inspect both locked E.R.C. storage and ordinary dungeon tables. The upgrade is not restricted to one container type. This matters when a player opens a crate and assumes the remaining capacity upgrades must all follow the same route.
Recover when a crate is still locked
First confirm that the object is labeled as an E.R.C. crate. Then search the same level for the activator pen, including spaces opened by the current objective and investigation clues. The official answer says the pen appears in different places, so leaving the entire chapter to search an old location is less useful than finishing the accessible rooms in the present level.
Return to the crate after obtaining the pen and use the normal interaction prompt. The success signal is the crate opening; an inventory upgrade may be inside, but the official support note does not promise that every E.R.C. crate contains one. If the crate opens without an upgrade, continue checking dungeon tables and later E.R.C. storage rather than treating the item as lost.
If no interaction appears despite carrying the pen, reload the latest save before inventing a keypad route or editing save data. Current patch notes should be checked next because a real interaction failure belongs to support, not puzzle speculation.
Because the game is built around limited resources, more space helps carry supplies but does not remove the need to choose fights. If ammunition is still the problem after increasing capacity, use the combat and ammo decision route.
A chapter-by-chapter crate map would require current screenshots, exact landmarks, and verification that locations do not change by version or difficulty. Until that evidence is complete, this page answers the stable mechanic and stops there.
Sources
QUICK ANSWERS
Questions players ask next
How do I expand inventory space?
Find an inventory upgrade inside an E.R.C. crate or lying on a table in certain dungeons.
How do I open an E.R.C. crate?
Use an E.R.C. activator pen found somewhere in the level.
Is every inventory upgrade inside a crate?
No. Frogwares says some upgrades lie on tables in dungeons.
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