I am sure it also contributes to the USPS going in the red every single year. I know we would all be screwed if the USPS ceased to exist or didn't provide free priority packaging anymore. Just pay for the Priority Mail service or use old boxes that came to you, diamond mailers, Uline boxes/mailers or something else if you are going first class.
We would ALL be screwed, indeed. 49 cent letters? Gone. $5 Priority packages? Gone. $20 overnight packages? Gone.
Those who have priced UPS and FedEx for their services will understand. Not everyone gets a corporate discount, either, and if the USPS vanishes, so will those.
Then you'll be paying $300 for your overnight package.
Nope another private sector company will easily take USPS place and do the job faster and more reliable to boot.