Fiting multiple items per box, how to calculate shipping?

Hi,

Here is the situation with the shipping process, how can I adjust the shipping weight/pricing accordingly?

When ordering more than 1; each frame weighs 16 ounces, each packaging weighs 8 ounces (we can fit 2 frames per box ... so it's 24 ounces for 1 frame, 40 ounces for 2 frames, 64 ounces for 3 frames, 80 ounces for 4 frames, etc).

If this is the case for all your products, you could use a table rate be item rather than based on weight.

Seems like it would work best that way, but what if the customer is in California (we're in NY) that rate should be different than someone in NY, we're shipping with USPS regardless...

Thanks!

Then you create zones and give them different table rates.