When I somehow tried to handle the Rucksack as a container I got the reply that I rather should look inside. Did I try to open it? Mmmh. You may try LOOK INSIDE BACKPACK for yourself and then see the result. Not sure though what triggered the first reply of the system that I rather should look inside the backpack. Anyway, if it is not added by you, then this is a system reply and you should get in touch with Chris to take care of that. Maybe it is documented somewhere, in the obj. ref?
Regarding the maze-feeling. I know that it was not actually a maze, I'm just expressing how it felt when you were wandering through the same-looking, different coloured transition rooms of the game.
Yes, having a 5 item limit may be realistic. I was more after logic with my hint. We all can can't barely carry more items with our hands than 5 or maybe six until it starts looking like a circus performance. But we can carry a lot more items with a backpack. So the player will think: hey what's up... just 5 items? I'm wearing a backpack! So you either should take the limit out or allow to carry more if the player is wearing the backpack. That would be a way to work around the issue that Adventuron doesn't support containers yet. BTW. you could try to replicate DAAD's logic of containers in code, where a container is just an inaccessible location. It uses then the LISTAT condcat to read the contents of the inaccessible location as container inventory.