Needles will fit, and it might be a good way to contain some. However, i like the idea someone else had here of using a case for mechincal pencil leads.

Certainly some thread and fishing line could fit, but how would be the issue. I think a cotter or hair pin could be used to wrap either around. You could do the same with some duct tape around something too. I like spools for sewing machines for these, but they will not fit in a sharpie.

I've got, although I sometimes question keeping, fishing gear around. However, it can supply food. Some hooks, sinkers and maybe a small spinner should fit.

A small x-acto or scapel blade might fit. It's not my first blade of chocie, but it's better than nothing.