Is there a way to hide a particular object so that it doesn't show in the list?

In my game players will have a backpack where their finds will be stored. I don't mess around with the complex and cluttered 'container' rules, and instead just make the backpack the parent of all items.

However, on 'i' I would like the list to say:

The backpack contains bottle of water, pocket knife, sleeping bag and tin of baked beans.

But if the backpack is an object, my inventory will say:

The backpack contains backpack, bottle of water, pocket knife, sleeping bag and tin of baked beans.