Because of my line of work as a farmer I have traditionally used a wallet type case with a folding cover and carried my phone in a shirt pocket.  My pants pockets are already full with other things.  Carrying a large phone in my shirt pocket has its drawbacks.  I have ordered another wallet type case already for my 6 pro that should arrive this week but am thinking I would like to try a horizontal holster case.  It needs to be secure and able to handle jumping off equipment, climbing through tight areas, etc. and a buckle might be a good idea.  I saw a OneTirgris holster on Amazon that might be a decent design but it is only rated for a phone 6.1" tall.  Does anyone have any other good suggestions?
Also, I will be traveling to Europe next month and would like it to be somewhat secure, though I might carry my phone in a pants pocket since some of the other things I normally have in my pants will stay home.