If you do not like cases because of the bulk may we suggest a skin?
With a skin you keep the same feel and dimensions designed by the manufacturer's while protecting again minor scratches, scrapes, and bumps that will bring down the resell value. Today Dbrand is offering a 25% of discount on their skins. I personally have nothing but good things to say about Dbrand and my go to choice in skins.
dbrand iPhone 6 Skins Nexus 6 Skins Note 4 Skins M8 Skins