Do I need RFID Blocking?
There has been plenty of writing about how RFID blocking material is not worth the effort or expense.
While it's an easy upsell for makers, it's just a solution in search of a problem.
Basically, it's possible, but difficult, and thieves have many other, easier ways to get this sort of data.
Spend your money on a high quality travel backpack instead, with multiple carry options, and monitor your personal data yourself.