Parcel shipping costs

Why one box costs more to ship than another.

1. 1Shipping ZoneCarrier distance band, from 2 to 8
2. 2Dimensional WeightBillable weight based on package size
3. 3Billable WeightThe weight a carrier actually charges for
4. 4Cubic PricingUSPS prices by package volume
5. 5SurchargeFee added on top of the base parcel rate
6. 6Negotiated RatesContract discounts off carrier list prices