USPS Flat rate package:
Flat Rate Envelopes 5.6
Legal Flat Rate Envelope 5.75
Padded Flat Rate Envelope 5.95
Small Flat Rate Box 5.8
Medium Flat Rate Boxes 12.35
Large Flat Rate Boxes 16.85
APO/FPO Lg Flat Rate Box 14.85
Prices taken from USPS website today. If everything went in medium flat rate or larger boxes It's hardly a rip off.