When you obtain items, they are stored into your inventory.

Your inventory has a fixed size of 20 storages.

Each item has a defined maximum amount per storage. Example: you can store up to 10 Lizard eyes per storage while you can store up to 20 Lizard paw per storage.

When this maximum is reached, the overflow takes a second storage in your inventory, then a third, and so on…

When all the storages are occupied in your inventory, you can't receive more items.
If you obtain an item when your inventory is full, the system will create a bag on the floor to store it.