eh, this is one area where I'm willing to suspend disbelief in service to a more attractive character model. Geralt shouldn't look like a US infantryman in full uniform, all laden down with sagging, ugly pouches and bags, and if it's realism you're after, nothing less than a covered wagon would suffice to store all the items in your inventory at any given time. I'd say a few side pouches to accommodate the bombs and potions, and all the extra weapons and armors I'm carrying can be chalked up to the RPG meta-game.