Ah, yes, I see. There are several item types that I have not seen in circulation in the game. I will have to see if I can restrict a container to hold just those items. Once I have that narrowed down, I have to come up with 8 heads so I can make a quest: "Eight Heads in a Duffel Bag"
Sticz 
You can; take a look at the Scroll Case bag item to see how it's done (the "broken shield/bracelet" itemtype is, counterintuitively, the one used for the vast majority of books in the game). [EDIT]Correction: look at the item, and the Store file with the same name as the item.
Just out of curiosity, aren't duffel bags a little anachronistic?
Edited by Azkyroth, 02 November 2006 - 12:27 PM.
"Tyranny is a quiet thing at first, a prim and proper lady pursing her lips and shaking her head disapprovingly, asking, well what were you doing (wearing that dress, walking home at that hour, expressing those inappropriate thoughts) anyway? It's subtle and insidious, disguised as reasonable precautions which become more and more oppressive over time, until our lives are defined by the things we must avoid. She's easy enough to agree with, after all, she's only trying to help -- and yet she's one of the most dangerous influences we face, because if she prevails, it puts the raping, robbing, axe-wielding madmen of the world in complete control. Eventually they'll barely need to wield a thing, all they'll have to do is leer menacingly and we fall all over ourselves trying to placate them." -godlizard