This means that the cost for shipping large, lightweight products – like a purse or a backpack – will be significantly higher in 2015 than it is today. If you are using FedEx or UPS Ground for shipping, it’s pivotal to determine now whether you will be impacted by dimensional weight pricing. Multiply the length, width and height of your package and divide it by 166 (the standard dimensional factor used by FedEx and UPS for domestic Ground shipments).