Can you send mail to a US Post Office to pick up later?

We’re going camping in Colorado this summer. Back in ye olden days, we just tossed our gear in our backpacks and went. But now we’re car camping with kids and we need quite a bit of stuff. Is it possible to send packages to, say, a Denver post office even when we don’t live there or have a PO box? I know there used to be General Delivery but I don’t know if that stopped since 9/11–would they worry about boxes sent to the post office?

If the USPS won’t accept packages, would one of those Fedex, UPS, Mailboxes, Etc.-type places take them?

USPS still does this

Greyhound Lines, what used to be the large bus company, ships packages or did lots of years back.

My inlaws have a fifth-wheel caravan thingy and head south for the winter. They get their mail forwarded to the local post offices on a General Delivery basis.

That’s good to know. I guess I’ll have to call to ask specifically about packages. I can see letters would be okay, but packages could have explosives or something in them, right? I’m wondering if they would see that as a security issue.

No more than with packages sent to someone. I don’t know how does USPS do it, but mail elsewhere gets X-rayed.

My brother-in-law frequently camps for long periods of time as part of his job, and picks up his mail via General Delivery at the local post office. I have sent him largeish packages this way with no problems.

The USPS sees that issue as revolving around knowing who SENT the letter, not who is receiving it.
Don’t sweat the package vs letter distinction in this.

Great! Thanks guys.