What's the difference between media mail & parcel post?

i sent out a package weeks ago and it's not there yet! i usually use USPS Priority mail,but wanted to save money and sent it parcel post instead, it was like $3.50 for a 4lbs. package instead of the $45 2nd day air.What's going on? i contacted the online store with a tracking ### and they have no records of receiving it
):
help!

Answer:
Media Mail - This classification of mail is a less expensive, but non-expedited, way to send books, printed matter, audio recordings, and other media mail. Delivery standards are 5-8 business days.

Parcel Post - This classification of mail is a less expensive, but non-expedited, way to send domestic packages. Delivery standards are 5-8 business days.

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