Hello Sandy,

Login to your Zen-Cart admin and go to Configuration: Then Shipping/Packaging.

This is how I setup my information:
Enter the Maximum Package Weight you will ship 22.72 What's your setting?
Package Tare Small to Medium - added percentage:weight 0:0 What's your setting?
Larger packages - added packaging percentage:weight 0:0 What's your setting?
Display Number of Boxes and Weight Status 3 What's your setting?

Package those 3 items together in a box. Take the dimension of the box. Add the information to sellonline.