There were other storage equipment that were intended for special uses.
The potion holder that Arthur got was one such equipment. Sword Sheaths, and other weapon holders also counted in the same category. And unlike bags, these didn't have the same slot preventing any conflict.
Their function was also different usually intended for faster access to the items. Having a Sword Sheath tied to one's waist or back allowed for a faster drawing and the same applied to the potion holder.
The player could quickly get to it and drink the potion, raising their chances of survival. Even if the time difference was that of a second or less, it could still be the difference between life and death.
In tense battles, this was highly important and one needed to be as fast as possible while conserving the least amount of energy.
>Dragon's Insight has been activated!<
~Ding~
——
Target: Large Leather Potion Holder
Type: Potion Holder