Grabbing an Aqua Sac in Monster Hunter Wilds is important early on if you want to craft a water element weapon from the Balahara tree. Since you'll find yourself in the fiery Oilwell Basin before too long, there's no harm in acquiring a weapon that deals water damage for a little extra effectiveness against those fire monsters...
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How to get an Aqua Sac in Monster Hunter Wilds
Source: PC Gamer (opens in a new tab)