USPS is actually an extremely effective lightweight parcel courier. Their rates aren't great for big, heavy stuff, but for typical ecommerce volume their rates

USPS is actually an extremely effective lightweight parcel courier. Their rates aren't great for big, heavy stuff, but for typical ecommerce volume their rates are very competitive. They're also the only major courier who is anywhere close to maintaining their pre-covid delivery times. Outbound UPS delivery times from my area, for example, have more than doubled since March (from avg 5 bus days, to two weeks), while USPS volume is maybe a day slower on average. (avg 2.5 days up to avg 3.5)