When a USPS truck comes to the PO to pick up mail, here is how the mail is loaded onto the truck:
First - Express Mail
Second - Priority Mail
Third - First Class
Fourth - Parcel Post & Media Mail & other discounted mailing methods.
Sometimes, the truck is full after the Priority Mail is loaded. In that case, all the mail that didn’t fit on the truck stays at the PO until the next truck arrives. Between trucks, more mail arrives at the PO. When the next truck gets to the PO, the entire process starts over: it takes Express Mail first, then Priority Mail, then first class, and if there is room then it takes parcel post, media mail, etc.
This happens at the PO and each time the mail is moved from one truck/plane to another. And this is why I would never send a resupply box using any other method than Priority Mail (sometimes Express Mail). The chance of your Parcel Post package getting bumped from a truck/plane is HIGH.
In October, a friend sent me a package via Parcel Post from California to Kansas City. It took 5 weeks to reach me. Don’t believe the PO personnel when they tell you your Parcel Post package will arrive in 7-10 days. Chances are that will NOT happen.
yogi
www.pcthandbook.com
yogi