Another recommendation is this. Has worked great on both my 5x, and girlfriends 6p.

https://smile.amazon.com/SUPCASE-Release-Unicorn-Premium-Protective/dp/B015XA94OY/ref=sr_1_2?s=wireless&ie=UTF8&qid=1469134029&sr=1-2&keywords=nexus+5x+case

I purchased this one when it was on sale for $2: http://www.amazon.com/gp/product/B015GHQJ1U?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00

And I plan on also getting this one eventually, looks really nice to me without a huge loss of protection: http://www.amazon.com/dp/B015XA94OY/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=1KLLD1D5H6MZO&coliid=I1BJW6J5APWE5G&psc=1

I absolutely loved this case on my MotoX so I have ordered one for my N5X: http://www.amazon.com/gp/product/B015XA94OY?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00