I've done courier work in the past. It paid okay, plus I got mileage reimbursement.
It was usually architecture plans, contracts, scripts, line art and other ephemera that can't be done digitally.
Sometimes they want something like a couple boxes of T shirts or a bunch of event materials dropped off.
Once I was paid to move a PA speaker and microphone from store to store in the NYC area.
It was a month of $75 gigs that took about 45 minutes each.
Some areas require you to be licensed/registered or affiliated with a courier business that is licensed.
With gas prices so high, the mileage reimbursement may not be so great.