Is there a way to add extra weight to the order for packaging materials? My small 1 qty orders typically come up showing much less shipping as a product weighing 13 oz actually costs equivalent of 2 Lb for shipping. If I add extra weight to each products than I am discouraging customers from ordering multiple quantities as the shipping cost comes up too high. The problem is amplified with US Mail shipping type as the difference between say 2 Lb and 2.2 Lb package is $2.80. My old shopping cart allowed a mark-up on weight in addition to mark up on cost to cover the extra packing weight.

No, there isn't.