Any tonneau cover recommendations?

Anybody have recs on a truck bed cover that keeps bad people out and equipment dry?

I’ve had a Bakflip for about 6 years now. Durability is okay. No functional issues, but it’s showing its age, more so than a one piece fiberglass cover. For transporting bikes, especially MTBs on the tailgate, I don’t think I could live with a one-piece cover.

As for security, no issues with Bakflip. Locking is provided by the tailgate. In order to open the cover, the tailgate needs to be opened. Sufficient to prevent smash-and-grabs, which are the most typical. If a professional thief is hellbent on getting to what’s inside, he’ll get in regardless. That’s what vehicle insurance is for, so hold on to your receipts.