I think all crafting materials including Crystals,pickaxes and hatchets should stack at 99.This in turn would fix a ton of inventory issues. Too often you go to a party and get swamped with them.Even crafting during a party because you need more space is pushing it bad. I am out of space time to craft so I can make room. Oops he died!

Foods,drinks,Medicines should all be stacked as well.