|Index||-||FAQ - Cart Help Buttons - Cart Settings - 6. Shipping Options - Approved Shipping Methods - Configure Approved Method|
You can use this field to set the maximum number of boxes allowed per shipping method. If your shopper orders more items than will fit in the number of boxes then they will receive an error message.
This feature can be used for very small shipping methods such as "UPS First Class Mail" to prevent the cart from breaking the order up into dozens of tiny packages.