Medical Bag

 is one of Jonathan E. Reid's passive skills.

Skill Description
Increase the number of serums you can carry

Tips
To be honest, I'm not a good combat game player, not skill in fight control. But even though, I finish this game in Normal Mode without using any serum (of course I died many times and retried). So I believe that you will not really need using serum too. One more thing need highlight is when you died in a Boss fight, you will reborn (maybe actually is revived), with all your weapons, items, experience and skills, only one thing is missing: the serum you already used in Boss fight. So it was just gone, and if you rely on serum to fight, you must try to refill them (or even need to retrieve / buy). In total, no need waste any experience on this.

Related

 * Passive Skills