Hi all, I'm working in Odoo v16 and getting frustrated trying to navigate the packages/packaging/shipping settings. I've read the support documentation and find it quite vague. I'm using Odoo primarily for ecommerce. Each of our products ship in a different box size. 

Product A - 20x25x26 and 10lbs

Product B - 13x9x7 and 3lbs

Etc

Customers add to cart and guide themselves through checkout. However, I am struggling to find a way to associate specific products with the box dimensions in which they are packed, so that UPS will retrieve the appropriate rate. I only see the ability to associate a single box size with a particular shipping method which doesn't work when there is an ecommerce cart with multiple products each in different box sizes. 

I've tinkered with Packages and Packs and neither seem to accomplish this ecommerce need. It's a common function on most ecommerce platforms to retrieve a shipping quote for cart with a mix of box sizes/weights, so I feel like it's here and I'm just not seeing how the pieces fit together. What am I overlooking?