- A reference guide and manual in Russian for Heroes 3.

"The Grail... will appear in the backpack of the hero who conducted the excavation. However, for this to happen, there must be at least one free slot in the backpack."
A similar requirement for free space in the backpack is sometimes encountered when obtaining artifacts.
Question: What is the backpack's capacity? How many artifacts can it hold? I don't remember a situation where something I took couldn't fit in my backpack.