Hi @TheBarrelKing and welcome to the Seller Community! Unfortunately, there is not a way to support more box sizes. You can try to work with your shipping carrier to see if they can provide more box sizes outside of Square, or make some changes to your shipping methods to account for the box limits at this time. I know it's not an ideal solution, but I will pass the feedback onto the development team for you!
AshleyK
Community Moderator, Square
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