I wonder if you could get uniform pressure by putting the juice bag itself in some fluid, then pressurizing that? I mean obviously you could, but I don't know

I wonder if you could get uniform pressure by putting the juice bag itself in some fluid, then pressurizing that? I mean obviously you could, but I don't know if you could get 15 bar or whatever they are going for using something relatively inexpensive. (OTOH, it would be annoying if it exploded)