Please reccomend a sturdy utilitarian camera strap for F4

Domke gripper straps, 1" or 1.5" wide depending on your preference. They're not bulky, made from durable webbing with or without quick releases. I've never had one slip off my shoulder. Plus they're inexpensive and come in different colors.

Op/Tech. I use them on my older Nikon's, my Mamiya 645's and even my RB67's. Strong and comfortable.
I use the Nikon logo straps on my newer (dig**al) Nikons.