With Boxify, you don’t set up rules governing how many of which product can fit in which box. That would be very hard to do in general, because there may be hundreds or thousands of different products in a shop, and customers can purchase any combination of different products in different quantities. So it would be near impossible to create a set of rules that governed which box or boxes should be used for all those combinations.

With Boxify, you don’t have to attempt that. The app itself figures out which is the appropriate box to use based on the dimensions of your products and shipping boxes. If the cart items are so large or so numerous that one box isn’t sufficient, Boxify will figure that out, too, and determine a set of boxes that can hold the cart items. Boxify will then use its packing solution to display appropriate shipping rates. All you need to do is to set the proper dimensions for your products and shipping boxes (along with certain associated parameters, which you will be prompted to enter on the relevant input screens).