If you want to maintain the sleek form factor of your Galaxy S9 or S9+, but you still want to at least protect it from scratches and scuffs, then a thin case is the best way to go. These are the best you can buy for your phone.
Spigen Thin Fit
This case offers excellent scratch protection with a bit of drop protection, thanks to reinforced corners. There's a raised lip around the screen, as well as the fingerprint sensor and camera, and there are precise cutouts for all the buttons and ports. You can snag this in black, blue, or purple for both the Galaxy S9 and S9+ (which also has a gold option).
No bulk here
Totallee Ultra-Thin Case
Totallee is another one of those companies that makes cases that are so thin you barely realize they are there. This line of cases comes in four different colors, measures in at just 0.02-inches and is available for both the Galaxy S9 and S9+.
Samsung silicone protective cover
Samsung's silicone case for both the S9 and S9+ comes in four colors and is guaranteed to fit your phone perfectly, with its soft, matte silicone and shock-absorbent protection. It comes in four colors and helps keep your S9's form factor nicely.
Peel Super Thin
Peel's cases live up to their Super Thin name, and they have a translucent finish that comes in black, silver, or navy blue. The branding-free cases are about as thin as it gets and really only offer scratch protection, but they certainly won't add any unwanted pocket bulk.
Skinit to win it
Skinit Lite cases
Looking for a more interesting design or graphic for the back of your Galaxy S9 or S9+? Skinits cases have everything from NFL logos to Dragonball Z and much, much more. These cases are incredibly thin, and are quite reasonably priced for graphic cases. Just make sure you choose the correct phone size before checkout.
Clear as day
ESR Essential Zero
If you want it to look like your S9 or S9+ has no case at all, then go with ESR's Essential Zero, which is only 1mm thick, and is flexible, with a "micro dot" pattern that prevents the case from clinging to the back of your phone.
Smooth and skinny
Torras Slim Fit
These matte-finished cases come in a few great colors and hug your S9 and S9+ snugly. The inside is lined with microfiber to help further prevent scratches, and the matte finish helps you keep ahold of your phone.
This "case" is actually a bumper that just covers the edges of your Galaxy S9 or S9+. It protects the most vulnerable parts of your phone without adding bulk and upsetting the natural shape of your S9. This case meets military drop test standards and leaves the back of your phone completely open, making the CrashGuard completely compatible with wireless charging.
Minimal protection found here
Even though you want to enjoy the in-hand feel of your Galaxy S9 or S9+, it's still a good idea to protect your investment with at least a thin case. Your best option is the Spigen Thin Fit, since it offers the best balance between protection and a slim profile.
But if you want something with an even lower profile, then you'll want to check out the Totallee Thin Case. This case measures in at just 0.02 inches for an ultra-slim and lightweight case while feeling premium. You won't get the most protection here, but there is enough to at least help in the event of a drop.
If you decide you want something with a bit more protection, or a case with an extra feature like a kickstand, there are plenty of other cases on the market for the Galaxy S9 and S9+ out there for you.
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