If one is used to carrying a pocket knife during the week, is it ok to carry one on shabbat?
For some more background, assume it is a spring-assisted or "button knife" but not generally something people would repair on the fly, so shouldn't be worried that it would be repaired if broken on shabbat.
Second, would it make a difference if it was purchased separately, and isn't used during the week? Or if it is toveled and can be used for food too?
Assume there's an eruv; this is a question of muktzah.