Do you have a list of custom box dimensions?
Do you have a list of the various package dimensions that I can import or enter into Custom Box Dimensions section? How do I determine the maximum number of bottles of 5x3x3 in 1 lb product can be combined into a single box?
We do not have a list of custom box dimensions. Usually, our customers use a varied set of products which need a variety of packaging options. So we leave it to them for the configuration of the boxes.
Coming to the second question, you need to keep a perception of stacking the product one on top of the other. So If you want 6 bottles to pack in one single box, then you can opt for a box with dimensions 5x3x18 (only height will increase because bottles will be stacked on top of other).
In this case, the maximum number of bottles that can fit in a box is totally dependent on the maximum dimensions of the box provided by UPS.
For that, you can go into the UPS price calculator and check for the box with maximum dimensions.