I love this clear case.
https://www.amazon.com/Covery-Protective-Degree-Shock-Absorption-iPhone/dp/B01EJ7PBE4
If you are an occasional phone dropper and feel it would be smarter to get a case with a little more protection, but still want a thin, minimalist case similar to a bumper, this is great IMO. The thicker, bulbous-like corners help protect the corners, face, and back in the event of a drop, but they don’t add bulk to the overall design. I also like the ridges on the sides for added grip.
The only problem with these clear cases is that they ALL eventually yellow after being exposed to sun and sweat from your hands. I start noticing it after about 6 to 9 months, but I tend to hold the phone a lot when I have the headphones on while walking in the city or hitting nearby hiking trails. (YMMV) Still, I liked it so much and it’s so inexpensive on Amazon that I ordered 4 more at once to keep in stock and just swap them out when one starts to yellow.
Here’s something else I ordered to hold my cell phone after seeing someone with one and love, love, love it. It’s one of the most useful purchases I’ve ever made on Amazon and think you might find it useful for Yosemite.
https://www.amazon.com/FinBurst-Running-Belt-PRO-Durability/dp/B019BHK7Y6
I use it to hold my cell phone securely at the gym or when hiking/running, but it’s also great for holding a wallet, keys, and the larger pocket will even stretch around a small (thinner) 16 oz. water bottle.
It is made of a very stretchy, thin, but durable material with a stretch waistband that adjusts and holds it securely around your waist so that it doesn’t move AT ALL even when hiking or exercising (including running), and is so comfortable I don’t even know I have it on. It’s also great if you’re in a crowded environment and worried about pickpockets because it holds things tightly against your body with no visible bulk, so no one would even know you have it on if you have a shirttail out hanging over it. I’ve often thought that if I ever get mugged, my pockets would be empty and the mugger would never know my wallet and phone were around my waist. 
I actually ordered the non-pro version before they came out with this pro version, but just noticed it seems to have disappeared along with my review, and it looks like all their products are on clearance including this one, so I’m guessing the company is shutting down. There are other brands out there with similar products, but this was the only one I found where the larger pocket was big enough to stretch around a water bottle, so I may have to order a couple more before they’re gone, especially at this price.