There is a limit to the storage size for Materials in your Item box. Currently, the storage size is set to a maximum of 5000. 

When the storage size reaches its limit, a red CTA will appear on your Item box, and the following actions will be unavailable:

• Hunting Large monsters (Field, Paintball, Urgent quests)

• Hunting Small monsters

• Collecting from Gathering Points (small/large)

• Receiving Quest rewards

• Receiving the content of Palico bag

In these cases, a message will be displayed on the screen indicating that the storage is full. To receive materials, please choose one of the following options:

• Select and discard unnecessary materials to free up space

• Purchase Item box Expansion from the Shop to increase the storage size for materials

• Consume materials by forging or reinforcing equipment from the Equipment

 Note:

• Even if the storage limit is exceeded, you can still receive rewards when ranking up in Hunter Rank.

• Items other than materials have their own individual limits.