Interestingly enough Fed-ex and UPS also just went up .
''On Dec. 28, for example, UPS Ground Services saw a 4.9 percent hike while UPS Air and International Service went up 5.2 percent
Also, on Jan. 4 FedEx implemented a 4.9 percent increase and its new “dimensional weight” pricing model which will in many cases also translate to higher costs.
Meanwhile, FedEx also raised its Home Delivery service from $2.85 to $3.00 and Ground Home Delivery from $2.90 to $3.10.''
http://smallbiztrends.com/2016/01/usps-shipping-rates-increasing-2016.html