I want one that is shaped like the USB-C port. Like it was extruded from the port. About as long as a key, maybe a shorter key, like a mailbox key. Has a rounded end with a hole to make a very sturdy keyring hole. Capacity is limited to what would be reliable and not overheat. <1g.
It sounds like you're describing the yubikey 5c form factor. Unfortunately I haven't been able to find a flash drive matching that form factor in my years of searching.