This is the one I bought and works really well.I learned about it from a video on stealing cars with the modern RF key fobs.... cars with auto door unlock and push button start, like our Jeeps. I believe these are actually less secure than autos from 10 - 12 years ago without push button start. There are many bag versions available, just google it. I chose this one:
Faraday Bag for Key Fob, Wisdompro WP4694 RFID Key Fob Protector RF Car Signal Blocking, Anti-Theft Pouch, Anti-Hacking Case Blocker - Black (PU Leather)
MONOJOY Faraday Bag for Car Key Fob Protector, Keyless Signal Blocking Key fob Black Pouch Anti-Theft Remote Entry Smart Fob Case 2 Pack https://www.amazon.com/dp/B076KZF64...abc_W093J6XC4QPYPD11H9QB?_encoding=UTF8&psc=1