In my setting, we have it where in order to actually kill a character you must invoke one of your aspects.  A thought would be to alter the role of Lawbreaker from being a thing you spend refresh points on to one where you must spend a fate point to invoke one of your aspects to actually break the Law of Magic.  So, if you needed to kill, you must invoke an aspect to do so.  With this, there is a price to breaking the Laws of Magic, but it's more personal (because of aspects) and not as impactful to characters in the long run.  If desired, maybe frequent Lawbreaking would require modification of an aspect to bring that broken law into the character (and serve as what they use to invoke when breaking the law subsequently).  Finally, if you still like the Lawbreaker powers, you could have it where spending a refresh on one allowed you to invoke that specific aspect to break that specific law without the fate point being spent.

Again, this is all just food for thought.

Ideally I want to make a "bag of holding" for my character. The idea is that it can hold X amount of stuff without being cumbersome, which doesn't seen like that alone is a big deal. But I am unsure of how such an little would work, both in game terms and in story terms.

I'd imagine that it'd be a small portal to a sealed chest in the Nevernever (which opens up fun story ideas with things being taken from it from the Nevernever, our something getting out from there when the portal is opened).

The idea that it could only be used so many times outer game session is kind of lame. If that was how it worked I'd expect that it could hold all kind of stuff, many this a super declaration sorry of item. Maybe it ours most it's strength into being able to be opened frequently, or it goes into duration so it is treated as active for a day our a week at a time.

I'd like input on this idea and my interpretation of both story and game mechanics behind it.