Yes, I would say that twelve could be fit. There are ten slots on either side, tightly packed. So, I would also not be surprised if I found more.

[The girl had always seemed to have a never-ending supply of them, and had to have been quite healthy to have carried as many knives around as she did. Even with the hole lightening the weight, it was still easily ten or more pounds in total of extra weight she always seemed to have.]

(OOC: That she did, so we can definitely work with it.)