One of the most popular case manufacturers is Spigen. And while the company is in the process of finishing OnePlus 5 cases for release, other well-known brands have cases that look just like Spigen.
TopACE is a trusted name we've used for years, and its new Ultra-Thin Karbon Fiber series looks to be a solid case for OP5 users. This all TPU case has a soft-touch matte black finish on the back that almost looks like brushed aluminum. Then, the top and bottom of the phone have soft fake Carbon Fiber accents. This is only for looks, but TPU is known for offering some of the best protection on any phone. It's a soft and flexible plastic and silicone mixture that works great.
This has a precision cutout for the camera and even an Apple-style OnePlus logo cutout on the back middle.
Buy it on Amazon for $5.99