Cubic pricing allows you to ship packages based on volume (length x width x height) rather than weight. This is cheaper for light, bulky items. Fulfillment centers can get deep cubic shipping discounts.
USPS SurePost splits shipping between UPS and USPS to reduce costs. UPS handles long haul transport then hands off to USPS for last mile. This leverages the strengths of both carriers.
Fulfillment centers get steep discounts on shipping supplies and carrier rates due to their high volumes. Outsourcing gets you instant access to those savings vs trying to negotiate on your own.
Evaluate carriers on cost, reliability, deliverability to your target areas, and ease of tracking. Balance cost savings with customer experience.
Fulfillment centers buy packaging at wholesale rates and can pass those savings to clients. Work with a fulfillment partner to access discounted mailers, boxes, etc.
USPS tends to have the lowest rates for light packages under 1 lb while UPS Ground is very affordable for heavier subscription boxes. Offer both to maximize savings.
All carriers have pre-set rates for different zones based on distance to destination. Compare zone rates as part of carrier analysis to optimize costs.
Once you hit certain volume thresholds you can negotiate custom discounts. Leverage a fulfillment center early on to access their negotiated rates.