Otterbox for the OnePlus 5
If you want the absolute best case in terms of durability for the OnePlus 5, consider the officially licensed Otterbox case. OnePlus teamed up with Otterbox to build a strong and durable case that isn't too thick. It's the perfect blend of protection and comes in a nice black or a sweet-looking Racing Red and black.
Otterbox is known for having some of the most rugged cases for any smartphone, so get this if you're worried about daily abuse.